[SOLVED] No signal, screen blank.

Mar 10, 2021
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Hi all,
I built a pc for my son just over 2 years ago, b350 motherboard, corsair 750 psu and an amd reyzen 5 3600. Can't remember the graphics off hand but it's worked great until it crashed, screen went white then when we tried switching back on, nothing. No signal.
I've removed and reseated the cpu, ram, graphics card and no change. I've tested the psu with a volt meter. Readings are 3.16, 4.54 and 11.54 so they look within 5 percent? If I unplug the pcu power the debug led stays on but not if I unplug the graphics card or hard drives. So I'm thinking it's either the graphics card or motherboard at fault? I've also removed the battery to reset the bios.
Any ideas?
 

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