In 2017, I got a whole new system with a cheap case, at some point during my tinkering the x370 board I was using died, I got it RMA-ed, but then the new board died again a few months later, I’m out of warranty so I got a new b450 board, ffw to today, I’m doing an upgrade and dug up the old case to build a second system using the old parts, everything worked fine until I put it in the case, where the B450 board died in the exact same way as the x370 (I still have the dead x370 board). On both board, the RGB can light up, CPU fan spin but GPU fan doesn’t spin, on x370 the debug LED will go through cpu mem vga boot and then nothing, on b450 there’s no debug led and speaker does not beep. No signal from the gpu. When I kill the power one of the fan on the gpu will jerk for a split moment. On b450, even if I don’t plug in any memory, there is no beep from the onboard speaker.
Between the x370 dying and b450, every other part have changed except the case and every other part I have verified to be working using other systems. what the fuck could be going on???
Make sure you don’t have more stand-offs installed in the case then the mainboard supports and ensure those in the case are in the correct position.
Don’t overtighten the screws mounting the board.
Use a decent PSU with sufficient power for the components you’ve installed and ensure it gets clean AC mains power. Use a UPS if mains power varies too much at your place.
Those run on their own wires that come with the case, usually hide within the case somewhere, and might need looked at.
I have a case that has USB and 3.5mm on a separate board in the front of the case in separate housing and the PCB is a few mm from a metal piece of the case.
It might depend on what wire is touching what (could be a lucky ground wire to case ground, could be frayed wires touching, or not connected at all from broken solder); but I’d probably just disconnect all front panel stuff from the motherboard for a quick test first before tracing wires
Do you have any components reused other than the case?
If so, pull the board, lay on the motherboard box, attach a different psu. See if it beeps (assuming you attach a speaker or the board has one).
No components installed.
if it beeps, install cpu ram (if no on board graphics) a GPU. Anything will work. Hook a monitor, NOT a TV.
No USB devices, period. No kb or mouse.
See if it beeps, and possibly posts.
If it beeps look up the beep codes and change components as indicated.
I’ve seen flaky usb devices cause a board to not post…
Just for the sake of completion, the motherboard should be on its box, with the only things plug in /installed are :
cpu
ram
(a different) psu
if no onboard graphics, a gpu. that is all.
i had a psu go out and take out the :mobo , cpu, spinning rust drive, m.2, and some other stuff. The psu didnt turn on after that, but your might still turn on and still be bad.
Yes I tried switching everything else since I’m building two PCs, and everything else is functional. I think for sure the motherboard is dead, today I tried to do a bios flashback on the B450, and even that won’t finish, the flashback led is just on solid forever after the initial blinks and my USB activity light never came up.
Update: I just found out that the boot ssd for the old system is also killed, I guess that narrows down what happened a little bit? maybe the short happened around the sata port which is suspiciously at the corner where there’s no support, not that I was plugging it in when power is on but still.
