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Display problems should be isolated to the monitor/LCD, cable or the video adapter.
For desktop monitors always check that the cable is secure and the pins are aligned.

Common symptoms for LCD/monitor or video adapter failure includes:

Caps lock, num lock, and scroll lock LEDs respond to their respective keys even though the display remains blank.

Windows start-up sounds play, but the display remains blank.

The display is jittery, distorted, or flickers and powering up or down.

If the display is working but is displaying distorted lines, restart the system in safe-mode or safe-mode with basic video drivers. Software-related problems can be eliminated in safe mode.

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BOOT MODE and SATA Operation options in the System BIOS are the primary reasons for a No Boot issue after system board replacement, provided there is no hardware failure with System Board and Hard Drive.

If the technician can access BIOS before parts replacement, it is advisable to note down current setting in BIOS on a piece of paper PRIOR to replacement. (Highly Recommended).

If the system is not functioning before System Board replacement and the technician cannot access the BIOS and  retrieve the settings from the Original System Board, perform the steps provided in to following pages.

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no boot  after system board replacement 

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no boot  after system board replacement 

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You will need:

Your motherboard drivers. Use CPUID(CPU-Z) to find the model number if you don’t have it handy.

The archive program “7-Zip” available from http://www.7-zip.org/ installed.

A CD writer and a blank CD or a thumb drive or a USB hard disk

Your Windows 7 install disc if you already tried the system repair option, or the system repair option on the Windows boot options screen if it is there.

Another, working, computer.

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System board issues can be identified with the help of various indicators like diagnostics LEDs, power button LEDs and beep codes.

Isolation Step : By Removing Memory Modules

Easiest way to verify the functionality of system board is by removing the memory module. If 4 beeps are not heard while turning on the system then the system board is faulty.

System Board Errors

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A motherboard (sometimes alternatively known as the mainboard, system board, baseboard, planar board or logic board, or colloquially, a mobo) is the main printed circuit board (PCB) found in general purpose microcomputers and other expandable systems.

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If reseating the connection does not fix the issue, try resetting the power adapter.

Unplug adapter power cord from the wall outlet and from the system.

Keep it ideal for about 2 minutes so it will reset.

Reconnect adapter to the system and to the wall outlet.

If the LED is not glowing, may be adapter is faulty and further troubleshooting

If adapter works fine after reseating

Isolate the power adapter issue by removing internal connectors, power connectors, or the cable harness to identify whether any of these components are causing this issue.

Continue troubleshooting by reconnecting devices one at a time to identify the failed component (like hard drive, optical disk drive, daughter boards etc.).

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Verify the power source with another electrical device.
Verify that the power adapter works after unplugging it from the computer but keeping it plugged into the outlet.

Most power adapters have a simple diagnostic LED (Off, Green or Blue) for troubleshooting:

Green and Blue color indicates adapter is working fine.

If LED is off, reseat the connectors on the power adapter and the system and swap power cord with known good power adapter if possible.

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Before you begin the PSU BIST, ensure that the AC power cord has been disconnected from the PSU.

Power off the system. Unplug AC power cord from PSU, wait for 15 seconds for PSU BIST function to reset. Disconnect PSU cables to the Mother board and other components. plug-in AC power cord to PSU to observe the LED status.

Instruction:

Disconnect all the cables from PSU to systemboard

Plug in the AC power cord

Read the LED status

LED State | Description
ON for 3 seconds and OFF | PSU is functioning
OFF | PSU is faulty

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Before you begin the PSU BIST, please ensure that the AC cord has been disconnected from the PSU

Instruction:

Plug in the AC power cord

Read the LED status

LED State | Description
ON for 3 seconds and OFF | PSU is functioning
OFF | PSU, Systemboard or other hardware component could be faulty

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Verify the intermediary or connecting devices such as extension cords or surge suppressors.
Most mainstream systems now include a power supply with the built in self-test (BIST) feature that drives new troubleshooting steps. Press and hold the test button to run the BIST.

The test button and LED are on the side of the unit where the AC plug is located.

Check the Built in Self-test (BIST) test button and LEDs on the Power Supply:

If Built in Self-Test fails, remove connectors from Power Supply and other components then rerun test.

If the LED glows, the attached connectors are shorted or the component attached to the connector is shorted.

If the LED does not glow, the Power supply is defective.

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A power supply unit (or PSU) converts mains AC to low-voltage regulated DC power for the internal components of a computer. Modern personal computers universally use switched-mode power supplies. Some power supplies have a manual switch for selecting input voltage, while others automatically adapt to the mains voltage.

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The thermal pad is located inside the white envelope. A cleaning pad is usually shipped with the thermal pad; however, you can also use isopropyl alcohol and a lint free cloth.

Using a cleaning pad, clean all debris from the surface of heat sink and processor.

Carefully pull the top film liner at a 45-degree angle until it is fully removed.

Remove second liner also completely. One side of the thermal pad is now completely exposed.

Place the exposed side onto the processor and apply even pressure across the pad.

Remove the remaining two liners and then assemble the heat sink to the processor.

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Dell supplies thermal grease and an alcohol swipe in service kits.

Use the alcohol swipe to clean the old material from the surface of processor and heat sink. You may need to use a plastic scribe to remove hardened thermal material.

Use the syringe to apply thermal grease in a swirl pattern. (As shown in tne picture)

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If the system's thermal solution (heat sink) is disassembled, ensure that all thermal interface material is in place:

Between CPU and heat sink, ensure thermal grease or a thermal pad is in place.

Between the heat sink and the graphic processor unit (GPU) - Portables only, ensure colored pads are in place.

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Overheating and intermittent shut down may be caused when debris or dust clog the fan exhaust port. This is especially notices on systems operating in a dusty environment.

Clean the clogged parts by blowing air directly into the fan exhaust port (either by blowing with mouth or using compressed canned air).

The air must be sent directly into the heat sink vents. This is always on the sides or back of the machine.

Limit the duration of compressed air (short 2-3 second intervals) to avoid excessive spooling (RPM) of the fan

If you cannot get compressed air into the exhaust port, place a vacuum hose on the intake port to extract the debris from the bottom of the system.

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its when the computer turns off because of heating

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a high-capacity, self-contained storage device containing a read-write mechanism plus one or more hard disks, inside a sealed unit. Also called hard disk drive.

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MpMemory is solely dedicated to testing the memory on the computer;
MpMemory stands for Multiple-Processor Memory.

MpMemory test is one of the best memory tests available without using hardware-based memory testers.

The tests provide DIMM isolation, identifying which module is failing, however time taken to run this is too long, 12-16 minutes per GB.

The tests avoid the 4 GB limit allowing testing up to 64 GB of memory.

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MemRx will identify and mask defective blocks of the memory provided the failures are contained within 50,4 bytes, without any user intervention.

The Key features of the MemRx tool are:

MemRx is a tool that can successfully repair and ignore defective memory areas by masking the address from system usage.

It requires a UEFI version of ePSA to run; this information is displayed at the lower right hand corner of the ePSA diagnostics.

The technology is similar to Hard Drive repair utilities (CHKDSK or Scandisk).

It is independent of DIMM isolation, which means that the tool cannot identify which DIMM is failing on its own.

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the power or process of reproducing or recalling what has been learned and retained especially through associative mechanisms

began to lose his memory as he grew older

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For system-board with and on-board speaker check for beep codes.

Checking a beep code involves inducing an error condition such as removing all of the memory.

If the system beeps, the processor is performing basic functions and is likely not the source of the problem.

If there are two processors in the system ensure 2nd processor is removed while testing for beep codes. If you do hear beep codes, swap the processor and test again.

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Ensure through event logs (either in BIOS, or in the OS) that the system is not shutting down due to thermal issues.

If thermal issue is confirmed follow the steps below:

Ensure fans are operational.

Ensure heat sinks are not obstructed.

Ensure thermal material is in place.

For system-board with and on-board

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a machine that processes something.