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Troubleshoot issues:

Symptom or Error Messages What to do
System shuts down unexpectedly Try to find out what was happening at the time of the shutdown to pinpoint a device causing the problem. Possible sources of the problem are overheating or faulty RAM, motherboard, or processor.
System shuts down unexpectedley and starts back up Begin by checking the system for overheating. Is the processor cooler fan working? Go to UEFI/BIOS setup and check the temperature of the processor. When the processor overheats and the system restarts, the problem is called a "Processor thermal trip error".
System locks up with an error message on a blank screen These error message, are most likley caused by an error at POST (Power On Self Test). Begin by troubleshooting the device mentioned in the error message.
POST code beeps One or no beep indicates that all is well after POST. However, startup UEFI/BIOS communicates POST errors as a series of beeps before it test video. Search the website of the motherboard or UEFI/BIOS manufacturer to know how to interpret a series of beep codes. You might need to re-start the system more than once so you can carefully count the beeps.
No power If you see no lights on the computer case and hear no spinning fans, make sure the surge protectot or wall outlet has power. Is the switch on the rear of the case on?, Is the dual voltage selector switch set correctly? Are power supply connections securely connected? Is the Power supply bad?
Blank screen when you first power up the computer, and no noise or indicator lights Is power getting to the system? If power is getting to the computer, address the problem as an electrical problem with the computer. Make sure the power supply (PSU) is good and power supply connectors are securely connected.
Blank screen when you first power up the computer, and you can hear the fans spinning and see indicator lights Troubleshoot the video subsystem. Is the monitor turned on? Is the monitor data cable securely connected (VGA cable) at both ends? Is the indicator light on the front of the monitor on?
BIOS loses its time and date setting "CMOS battery low" error message appears during the boot The CMOS battery is failing, Replace the battery.
System reports less memory than you know is installed A memory module is not seated correctly or has failed. Begin troubleshooting memory.
Fans spin, but no power to other devices Begin by checking the power supply. Are connectors securely connected? Use a power supply tester to check for correct voltage outputs.
Smoke or burning smell Consider this a serious problem. Immediately unplug the computer.
Loud whining noise Most likely the noise is made by the power supply or a failing hard drive. There might be a short. The power supply might be going bad or is underrated for the system.
Clicking noise A clicking noise likely indicates the hard drive is failing. Replace the drive as soon as possible.
Intermittent device failure Failures that come and go might be caused by overheating or failing RAM, the motherboard, processor, or hard drive. Begin by checking the processor temperature for overheating. Then check RAM for errors and run diagnostics on the hard drive.
Distended capacitors Failed capacitors on the motherboard or other circuit board are sometimes distended or discolored on the top of the capacitor. Replace the motherboard.