Hello, I got some serious problems. About one week ago I accidentally cut off power of my pc while he was updating. When rebooting I got nothing but a blank desktop image, unable to give any input (mouse, keyboard, control + shift + delete). Control + shift + delete made the screen go black, so I assume this was my computer "loggng off" (enter caused the blank desktop screen to appear again). Normally I fix my computer problems myself, so I started to reboot in safe mode. This worked without flaws, I could start the system repair and startup repair. This however, made no changes (still got the blank desktop screen on booting windows in normal mode). Then I decided to reinstall Windows 7 Ultimate 64 bit entirely (on my ssd). There where a few problems (original installation cd wasn't recognized), but in the end (with someone elses cd), I got it running. I decided to start installing my motherboarddrivers (LAN, onboard VGA, ...). All went well. Then I installed the VGA drivers of my dedicated nVidia GTX 570, and there it went wrong; upon restart: same blank desktop. This time I had some input: I could right click on desktop, make new folders, go into configuration manager. But no cmd, no task manager, no msconfig, ... So, I thought: my VGA card broke down; and I tried another one (nVidia 9800GTX). Same problems. Fresh installation, now on a conventional 750GB HDD. Again: all went well, even installing the VGA drivers (note: I didn't install the mobo drivers by then). So I though: it's my ssd that broke down. Then I tried to install Windows 7 on my SSD again; runned like a charm. I first installed my nVidia drivers, then my mobo drivers and we're back at the blank desktop again. So: my last option was: clean install; VGA drivers, and only LAN-drivers (not internal VGA drivers for my mobo). This went well. So I thought it was all settled. I started doing Windows Update, and this is where it went wrong again: during Windows Update, my desktop went blank again (in the background). Now I really don't know what to do further. One of the error codes I got was: 80246005. I tried the catroot2 fix when I was still able to use CMD next time I installed Windows, but upon doing the updates, I got the blank screen again. Another note: upon booting, I am unable to go into safe mode: when using the arrow keys, nothing happens for some seconds, then suddenly, it jumps a few places (the amount of times I used the arrow keys), but then the counter is gone and enter doesn’t work. To summarize: - Windows Update doing really weird - Driver conflict? - I don't think my graphical card/hard disk broke down (maybe motherboard issues?) I hope someone can help me on this, I'm trying to fix this for a week already, and I'm really getting frustrated about it... Thanks in advance and best regards, Matthias Update 1: Sometimes, when trying to reinstall Windows, I get a 0x80300024 error code, even though I just formatted and removed the hard drive. I think formatting with Ubuntu solves this problem.