Bought a Cyberpower computer from Best Buy about a year ago yesterday. Had problems in October with it crashing, fan speeds up and screen goes to black. Best Buy said, "Send it back." But that'll take 2 months. I changed the settings in the Windows 11 power settings and though the problem was fixed. After another Windows update, it's even worse now. Anyone know what's causing it? I've read dozens of reports. Some say power supply (it's new for God sake), others software settings, others video card. Help?