What have I done?

[LordHaveMurci]

Removed a firewire card from an old PC earlier as the PC wouldn’t even boot.

Went to fit it to my current Win10 PC & there’s no PCI(?) slot so I put the side back on & plugged the PC back in.

I didn’t notice the PSU switch was set to ON when I plugged the power lead in, think I heard a pop or similar, now the PC powers up but won’t boot up.

Will it be the PSU, despite the power light being on & what sounds like a fan spinning up on power on?

Having a run of it at the moment!

[Mars]

LordHaveMurci said:

Removed a firewire card from an old PC earlier as the PC wouldn’t even boot.

Went to fit it to my current Win10 PC & there’s no PCI(?) slot so I put the side back on & plugged the PC back in.

I didn’t notice the PSU switch was set to ON when I plugged the power lead in, think I heard a pop or similar, now the PC powers up but won’t boot up.

Will it be the PSU, despite the power light being on & what sounds like a fan spinning up on power on?

Having a run of it at the moment!

The pop will be just the PSU connecting to the mains. It shouldn't have hurt the PC. Remove the firewire card first the attempt a restart to at least confirm the PC is working OK. If it does fire up without the firewire card, then I suspect there's a problem with that card. Try the PC it came out of to see if it boots without the firewire card.

[LordHaveMurci]

Mars said:

The pop will be just the PSU connecting to the mains. It shouldn't have hurt the PC. Remove the firewire card first the attempt a restart to at least confirm the PC is working OK. If it does fire up without the firewire card, then I suspect there's a problem with that card. Try the PC it came out of to see if it boots without the firewire card.

I didn’t fit the Firewire card, it was PCI (I assume) & my PC didn’t have slots for it.

I changed nothing!

[LordHaveMurci]

I’m guessing this shouldn’t be doing this?!

[Mars]

Oh I see

Is that... glowing? If so then, unless it's an LED strip then I'd say your mobo is toast... or trying to make toast.

[Gary C]

Thats an LED strip

[king arthur]

Have you ever opened up your PC before? Might it have some sort of intrusion detection on it?

[mmm-five]

Looks like there's 2 or 3 PCIe slots on the motherboard to me.

Are you certain the old Firewire is PCIe?

[Hanslow]

You could always try a bios reset, likely removing the CMOS battery for a couple of minutes before reseating, and see if that resets the motherboard enough to allow it to boot again. If it's seemingly dead, you probably don't have much to lose.

[king arthur]

mmm-five said:

Looks like there's 2 or 3 PCIe slots on the motherboard to me.

Are you certain the old Firewire is PCIe?

PCI is not the same as PCIe

[LunarOne]

king arthur said:

mmm-five said:

Looks like there's 2 or 3 PCIe slots on the motherboard to me.

Are you certain the old Firewire is PCIe?

PCI is not the same as PCIe

I think the OP knows this - his first post said he realised that his current PC doesn't have PCI slots. I wish mine had PCI slots as I'd love to use my old firewire and SCSI cards. I have a bunch of slides that need scanning and my flatbed scanner isn't a patch on my Nikon Coolscan SCSI slide scanner.

[mikef]

LunarOne said:

I think the OP knows this - his first post said he realised that his current PC doesn't have PCI slots. I wish mine had PCI slots as I'd love to use my old firewire and SCSI cards. I have a bunch of slides that need scanning and my flatbed scanner isn't a patch on my Nikon Coolscan SCSI slide scanner.

You could buy an adapter card for PCI, I used to use one

https://www.startech.com/en-gb/cards-adapters/pex1...

[eeLee]

When it powers up but doesn't boot up, two things:
- what do you hear?
- what is on the screen?

[LordHaveMurci]

eeLee said:

When it powers up but doesn't boot up, two things:
- what do you hear?
- what is on the screen?

Fans spinning up then stopping.

Then spinning up again.

Keyboard lights up, then doesn’t, then does before everything shuts off.

This takes a few seconds.

[Digger]

Which fans exactly?

[towser]

this has faulty PSU vibes about it.....

[towser]

towser said:

this has faulty PSU vibes about it.....

replied in haste.....I've had a similar issue before with a machine that would on occasion briefly spin the PSU fans and then stop and wouldn't continue to POST. I did find in that case, oddly, that unplugging and reconnecting the power lead got things running again. I eventually replaced the PSU and the problem went away.

Alternatively, did you bump or unseat anything when trying to find a PCI slot?

[WrekinCrew]

king arthur said:

Have you ever opened up your PC before? Might it have some sort of intrusion detection on it?

Wouldn't that display a BIOS message and ask for a BIOS password?

I'd try reseating all power and signal cables first; PSU doesn't sound totally dead. If it's an ATX-style PSU you can test it by unplugging all power leads, put a paperclip between pin 16 (green, "power good") and any black / earth pin on the main socket, and check the other pins for 3.3v, 5v or 12v with a multimeter. Lots of examples of how to do this if you search. It's perfectly safe.
ATX PSUs are pretty cheap and easy to swap, just make sure you get one with the right disk-drive power connectors.

[LordHaveMurci]

Digger said:

Which fans exactly?

Case fan, CPU fan & I think, PSU fan too.

Don’t think I bumped anything, I have checked HDD connections.

My thoughts were PSU too, I have tried a different power lead & mains socket.

[speedyman]

A photo of the complete motherboard would be helpful, any beep code? Try reseating memory, does the fan on the CPU run ?