When the computer constantly restarts before getting to a login screen, a bit of troubleshooting is in order to make sure it’s not a software problem.
Try to boot in Safe Mode. If it doesn’t work, or you can’t even select Safe Mode before it restarts, then it’s almost certainly a hardware fault.
As many technicians can attest, RAM is the number one culprit. Essentially, the bootloader can’t load itself into RAM because the RAM has decided to take unofficial leave. The PC is able to power up normally, but it will constantly restart right before loading the OS.
The fix: Power down the computer, open up the case, and reseat the RAM modules. If the problem persists, the RAM might be bad. Keeping a few spare sticks of common RAM types (DDR2, DDR3) in your toolbox is highly recommended.
Now, if the restart loop is intermittent, but isn’t resolved by new RAM and you can still boot into Windows, here’s a tip for easy troubleshooting: Turn off Automatic Restart on System Failure. This makes the PC pause on the Blue Screen of Death so you can see the specific STOP error code.
The Microsoft support page on STOP error codes is incredibly helpful in diagnosing which piece of hardware is faulty. Use it.
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