Try Safe Mode next. If you get a display, head to display settings, set it to 800x600, OK your way out and reboot. If that fixes it, you can tinker later with display settings.
Hubby installed AVG a while back. Last week AVG Watch Dog took over his pc with "starting" and "finishing" screens and would not let him into Windows.
I took AVG's advice, created a boot USB and got rid of everything AVG on his machine. Yay.
Now, however, when his pc boots up, after the Windows XP startup logo, the screen goes black. The pc continues to run, and it takes a 4 sec. hold on the power button to shut it down.
Help? How do I get this fixed without reinstalling Windows? Again. And reloading all his stuff? Again.