The problem is caused by poor cooling and the problem still occurs, even with the upgraded heatsink which requires the revised motherboard to install since the GPU placement changed as a part of the “fix”.

Get your data off and scrap it or give it to someone to strip for parts. Both of these indicate a bad GPU and that you’re wasting your time troubleshooting it in most cases. However, garbage on the LCD is also common for partial failures. These systems have a tendency to lock up when the high level driver kicks in.This may be a backlight or LCD problem, but it’s very unlikely. The GPU failure is usually indicated by a solid black screen.Try the RAM if you want, but if it persists the GPU has failed. When the GPU’s fail, you tend to have POST problems.The symptoms you have are things I’ve seen before when the GPU fails. Plug it into a monitor and see if it locks up or does the same thing. That said while this is a common symptom shared amongst the DV series (and other 2007 nVidia systems), it can also be a bad LCD but this is rare.

Computer freeze black screen