This old Dell E5500 laptop I was refurbishing for my employer has an issue. The issue is that when it boots up, it starts loading windows, but before it gets to the log in screen, it stops, turns off, and leaves the numlock light blinking while the capslock and scrolllock lights are solid. In Dell machines this usually indicates a bad CPU/mainboard. Occasionally it will boot up fine, but acts really slow and if it does run, it doesn't run for long. Most times it will not. I have run other diagnostics (namely memory and CPU checks), and it comes back with no errors. I have also run the fixes from bootrec.exe, and that doesn't help. It seems to generate a lot of heat for being on such a short amount of time, so my diagnosis on this laptop is that there are three distinct possibilities:
1. The CPU needs new thermal paste between it and the heat sink (it’s dry and crusty, I checked).
2. The CPU is actually going bad
3. The CPU socket is coming loose from the motherboard.
I guess it could be the hard drive, but it's newer than the laptop itself, and it works in other machines and passed tests when I connected it to my machine via sata-to-usb adapter.
1. The CPU needs new thermal paste between it and the heat sink (it’s dry and crusty, I checked).
2. The CPU is actually going bad
3. The CPU socket is coming loose from the motherboard.
I guess it could be the hard drive, but it's newer than the laptop itself, and it works in other machines and passed tests when I connected it to my machine via sata-to-usb adapter.
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