My computer constantly crashing (Display

Crashing 1 - YouTube

This one ends with a black blank screen (it is not black as the display is shut down, it is black but it still glows so the display was still on)

Crashing 2 - YouTube

This one, I accidently finished recording too fast but I can describw what happened next after the video. After wha5 happened in the video, my computer's display turned all vertical stripes (light blue and lighter blue in between) and it stayed like that.

thermaltake tr2 600w is what I have for power supply.

I am sorry but what does thay mean? and is that a bad thing? What should I do?

You are right about seating at pciex16 but how do i know if it is running at x16

By the way, I am using dvi(comp) to vga(monitor) cable.

I have changed my cable to hdmi cable and it worked fine for one day (played game without crashing and stress test was able to go to 10 minute and did not crash) but the next day, the same thing happens like last week. (but stress test can hold it better than last week, at around 5 minute it starts to make a fuzzy break and than display driver has been blah blah and crashed the stress test program but not the computer at 7 minite and 30 second) and after 10 second, my comp crashed

It usually crashes before the comp even turns on ( before or during welcome screen) but when i get lucky i can get on my comp, which will crash eventually.