I just took my computer apart, took out all drives, and put in an SSD from my wife's old laptop. It wouldn't boot, so I plugged my drives back in.

Now I'm in a strange loop. Computer powers on, stays on 5 to 10 seconds, then turns off. Sometimes I get to a screen that says gigabyte dual BIOS, sometimes screen stays blank.

I've tried with just my system disk, with just a USB boot disk, and I've tried turning power off for 15 mins. Nothing helped.

Any ideas?