Computer is a modified HP Pavilion TP01-0157c. Erica motherboard; Ryzen 5 3400G APU. 12GB RAM, 256GB NVMe drive, 1 TB SATA HDD. Modification consists of upgrade to HP OEM 400W PSU (L04618-800) and the addition of a Visiontek Radeon RX 560 4GB. The GPU is bus-powered and the PSU provides more than the rated power requirement (yes, I checked). Outputs via mini-Displayport. Ryzen Master had been on the machine prior to the upgrade but is not doing anything; standard configuration.
Machine had worked fine until the 21.5.2 driver update last night. Suddenly it can't recognize my monitor, sees it as a 640x480 generic PnP. I used Windows control panel Apps/Features to remove the Radeon software in an attempt to redownload and reinstall last known good version. Once I did that, the following happened:
[ ] Web browsers will not "let go" of downloaded files. I can't launch applications like the cleanup utility from Downloads because the browser won't complete the handoff of the completely-downloaded file to the file manager. Browser hangs. When I try to close the browser it deletes the file.
[ ] I cannot launch the command line, either vanilla or Admin mode, from the Windows menu, the taskbar, or via Windows search. So, no sfc or any utilities like that.
[ ] I cannot open device manager.
[ ] I cannot boot into safe mode; any of them. F4, F5, etc. from cold start don't do anything.
[ ] I cannot shut off or restart the machine from the Windows button.
[ ] I cannot get into any of the Recovery options, launch Reset, or any of those other options from Control Panel or from shift-Restart.
Obviously this is frustrating. I'm looking for advice on how to get my machine, which is 3 weeks old and worked perfectly prior to this, back into the same condition it was in before that disastrous driver update.
