Think I fried the motherboard on my old PC

[Hoppled]

Just built a new PC last week and I was dusting out the PC I just replaced to sell it on ebay. I used a vacuum exhaust vacuum blower to get some of the dust out of the case near the bottom PSU compartment and the case fans.

To note, I took my current boot drive (m.2 NVMe) out and swapped it to my new build as I needed an extra 1TB storage. Left over there is a 240GB SATA SSD and 2TB HDD. Trying to boot up, the monitor cannot display a signal no matter what, no BIOS screen, nothing. Using a USB flash drive with Win 11 installation media does nothing, either.

Everything seems to physically power on including the mobo, the fans and peripherals. The white "boot" light on the diagnostic panel is on, but that thing came on every time I booted up the PC, which would subsequently turn off as I booted into Windows.

Things I've tried:

- Reseating RAM, GPU

- Booting with a USB flash drive that has Win 11 media

- Plugging display port into the mobo instead of GPU and trying again w/o GPU installed

- Tried GPU in 2nd PCIe slot

- Unplugged and plugged back in SATA cables to mobo

- Trying a different monitor using both display port and hdmi connections

- Resetting CMOS by using metal object on prongs, as well as removing battery

SPECS:

MSI MPG B550 Gaming Plus

MSI RX 6600 XT

Ryzen 5 5600X

G.Skill Ripjaws16x2 (32GB) DDR4

EVGA 600W 80 Gold+

WD 240 GB SSD + 2TB HDD

[Rod]

Bummer, Thats a tough one. Try all cables make sure they are all firm the psu. There could just be a random chance the cpu died? There will be diagnoatic type folk who will come along and give an opinion.

Thats a pc repair shop esque issue.

[[☥] - CJ -]

If you let the fans spin freely while blowing them out that could potentially be the cause

I Assume the 8pin 12v CPU connector is plugged into the board?

[_I_]

better to use an aircompressor

but boards are pretty resilient
double check all power connectors
you may have just flipped the psu power switch

[Hoppled]

_I_ lähetti viestin:

better to use an aircompressor

but boards are pretty resilient
double check all power connectors
you may have just flipped the psu power switch

Thing is, this PSU is not modular, so there's no back connection ports, the cables just come from inside the PSU. I didn't touch any mobo cables when dusting the PC either, just dusted near the PSU. ATX is in firmly as well as GPU/CPU. CPU has a thermalright cooler on it which was also untouched besides the dusting.

[[☥] - CJ -]

I believe he means the On/Off switch at the back of the PSU

But you said that everything seems to power on, so i suppose that wouldnt be the issue.

[Iron Knights]

If you don't see a Post with CMOS battery out, something is fried indeed.
Easily done with static electricity, never vacuum (resistors and caps), always blow dust out.
And wear rubber surgical gloves for protection.
Test with the new PSU, then you eliminate one source.

[Hoppled]

Iron Knights lähetti viestin:

If you don't see a Post with CMOS battery out, something is fried indeed.
Easily done with static electricity, never vacuum (resistors and caps), always blow dust out.
And wear rubber surgical gloves for protection.
Test with the new PSU, then you eliminate one source.

I was using the exhaust from the vacuum that blows air, does not suck. Either way, I know it can cause static, I just thought since it was blowing air out of the case it wouldn't be a problem.

My hunch is the mobo is fried, but I get that the PSU/CPU can also be the culprit. I ordered a cheap mobo off amazon to see if that will fix it, if not, I'll return it.

The fact that all the lights and peripherals turn on though, make me think it has more to do with the mobo than PSU, Idk though.

[Iron Knights]

Lights would be off on fried MB, more likely CPU. But PSU is cheaper to test since you HAVE one.

[Iron Knights]

However, could be fried GPU also. Was the SATA SSD a boot drive ? Or did you remove the only boot drive ?

[Hoppled]

Iron Knights lähetti viestin:

However, could be fried GPU also. Was the SATA SSD a boot drive ? Or did you remove the only boot drive ?

I removed the only boot drive which was a m.2 NVMe SSD in the m.2 slot on the board. But the SATA and HDD drives were in there, so it should at least boot to BIOS or allow me to boot with windows on a flash drive.

Also, I tried taking GPU out and using the mobo graphics, no fix, so I don't think the GPU is part of the problem currently.

You really think its the CPU? Can't a mobo be broken yet still have the lights on?

[Iron Knights]

Either one possible at this point but also a broken PSU.
Good brand but low wattage for that setup.

[_I_]

Iron Knights lähetti viestin:

Lights would be off on fried MB, more likely CPU. But PSU is cheaper to test since you HAVE one.

not always, parts can break
might have just fried the bios eeprom or something
i have seen boards that lightning took out the lan or audio parts but the rest of the board worked fine