Can anyone help? No Monitor Signal After Cleaning PC

lucysilver · January 23

Hi all, was looking for some advice after my PC stopped sending a monitor signal after cleaning it. Here's all the noteworthy/relevant info:

My PC was *very* dusty when cleaning it – I haven't really done a proper clean since I got it a bit less than a decade ago. I cleaned it with compressed air and carefully swept the top of the PSU and the hard drive bay with a dry microfibre cloth, making sure not to touch the motherboard.
I didn't disassemble the PC, take off any fans or take out memory or anything, I just dusted it as it was.
All the LEDs turn on, all the fans still spin.
I got a new GPU a few days ago, a 4070 Super to replace my 1080 Ti. The PC worked fine with it. I've tried both GPUs and neither send a monitor signal. I've also tried cleaning the inside of the PCI-E socket with compressed air since, to make sure there's no dust in there, with no luck.
I have also tried another monitor, no luck.
I tried reseatting my memory, after spraying compressed air into the memory slots, no luck.
None of the EZ Debug LEDs stay on. The CPU one briefly turns on, but turns back off in less than two seconds.
I've heard testing if the Caps Lock LED on my keyboard would confirm if it's booting to Windows – the light doesn't turn on, so I assume it doesn't get to windows.
It stopped working last night, and still isn't working this morning.
I sprayed compressed air through the CPU fan down onto the heatsink. I can't think of why this would affect anything, but thought it was best to mention.
No iGPU to test with (R5 3600)