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Lazyweb: I'm trying to debug this PC I've had for a while that just doesn't work. It was spontaneously rebooting for a while, then it just got to the point it reboots at firmware screens now.

* Removed disk, nothing changes

* Swapped PSU, nothing changes.

* Swapped CPU, nothing changes

* Swapped mobo, nothing changes

* Swapped RAM, nothing changes

* Removed mobo from case & started with a screwdriver, nothing changes

I've replaced the system, but I'd like to know why it doesn't work. Why?

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@calvin hmmm could one bad part (like the PSU) be corrupting the other parts as you keep swapping stuff in and out?

@MightyPork My theory was the CPU going bad - I didn't try the G3258 in the B85M board, because I didn't have it then. The PSU seems clean.

Also more options:

* Resetting CMOS, nothing changes

* Installed a GPU (an HD6670) instead of IGP, nothing changes

The current board installed is a GA-B85M-D3V, previous board was an H81M-P33. (which I still have, but swapping is a PITA so I try to keep changing to a minimum when debugging) CPU is a G3220, and have tried a G3258.

PROTIP: When someone tells you building PCs is easy, they neglect to tell you what isn't is the fucking computer Kreminology that is consumer electronics debugging.

I've sworn off whiteboxes as a result of this charade - it's used businesses desktops that go off lease from this point on.

@calvin could it be a faulty cpu fan or bad thermal paste causing the cpu to overheat and trigger a reboot?

@pho4cexa The fan while a PITA to install, (the pushpins are only easy the first time) spins fine and I apply new paste each time since it's been a while since swaps. The H81 board gets further into the boot process (it can get to the BIOS config screen if lucky, which shows the fan is spinning fine and the CPU is running at like 30C) than the B85 board.

@calvin same behavior with all usb and other peripherals unplugged? I've seen a usb flatbed scanner cause a system to fail to boot in the past...

@pho4cexa I only have a PS/2 keyboard and VGA monitor plugged in. (and power, OFC)

@anarchygarden No beeps; I think the most was scroll lock blinking briefly?

It does require both the PC speaker is working and connected for post beeps

@anarchygarden don't have one connected unfortunately, and I cant seem to find mine

the mobo manual is useless for debugging anyways - no beep codes!

@anarchygarden the RAM seems to work enough to get to the splash screen (only like a quarter of the time) though; doesn't matter which way I put it

@anarchygarden @kel it just spins the fans, stops spinning, then spins again with the power LED on at the same time as it spins