Wonderful. Switched on my dual-GPU Ubuntu machine earlier and it seemed to take quite a bit of time to load. Logged in, got to a browser, and there was no internet. Checked the cable, rebooted and now it's not even showing anything on the monitor. Super. I'm wondering if I might need to change the PSU from the 750W one to the 1,000W one, but I doubt that would cause issues unless it was under load. Mobo ded?

Managed to get into the BIOS and to the slow networkless boot by a mixture of a hard reboot and power cycling the monitor (which is a first). Messed around in the BIOS PCIe stuff just to feel like it was a worthwhile endeavour and it's still not working without a full power off. Hmm.

Bugger, it's not responding. No motherboard lights indicating anything untoward. Guess I'll change the PSU, try again, if that fails check with a USB stick and if that works go for a reinstall.

@davep Fingers crossed for you. At least it sounds like you already have the 1kw PSU to hand?

@woe2you Yup, arrived the other day.

@davep Hopefully that fixes it. I had a PSU crap out on me a couple of years back, it was very annoying. I'd just bought Helldivers 2 because everyone I knew was raving about it. I got halfway through the tutorial, to the bit where you learn how to drop a tactical nuke on something (my terminology may be off, the experience plus UI niggles put me off the game so much I never played it again) and right at that moment it let the magic smoke out.

Luckily a mate had a spare one NIB he let me have for a song. It even had the same pinout so I didn't have to junk all my custom cables.

@woe2you Changed the PSU, reset the CMOS, got into Ubuntu and removed stuff like docker that might be messing with my network settings (I think I installed it last night and it's been playing up since the next reboot). Only problem is, it still seems to randomly not start properly. 100% reboots fail, random hard boots succeed. Noticed that docker decided to modify my Nvidia drivers too, which isn't optimal. What a pain in the bum.

@davep Fractally fucked? Keep us posted. I like haunted computer stories.

@woe2you Even in recovery mode it can't start networking. Nvidia drivers I had specifically installed for these Pascal cards isn't installed. Currently letting it sit and think about its life choices without power before reinstalling Ubuntu.

@woe2you Finally got it doing a net install. I'm worried there's something else up at the BIOS level though, or it's being finicky about which GPU port I'm using.

@davep @woe2you Completely a shot in the dark, but try replacing the CMOS battery. It caused all sorts of weird power- and boot-related fuckery for me, and was a $1 fix.

Bugger, it's not responding. No motherboard lights indicating anything untoward. Guess I'll change the PSU, try again, if that fails check with a USB stick and if that works go for a reinstall.

@davep Axe or chainsaw. Always works. Or the pond.

@VickForcella I basically ended up going through the same process I went through nearly a decade ago, which I'd obviously forgotten.