Wierd Black Flash With Green Bar?

Hello Everyone,
I assembled my computer about 2 months ago and I am experiencing a weird problem. At certain points when i open firefox or an application that displays a single (or almost single) color on start up (have google set to my homepage so its mostly white), I get a weird black screen with a green bar for hardly a second. This is starting to worry me as the computer is still so new. Here are my specs:
ATI Radeon HD 4890 GPU
Asus VH236H 23" Monitor @1080p
Windows 7 Ultimate 64-Bit
AMD Phenom ii x4 965
4GB of Mushkin Blackline RAM @ 1600mhz
WD Caviar Black HDD
Asus M4a79T Deluxe Mobo
I'm freaking out over this so any help would be appreciated!
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More about wierd black flash green
  1. Update:
    just tried playing crysis to test my graphics card and i got a BSOD. I am really worried now, any help would be greatly appreciated!
    Thanks in advance!
  2. What is your PSU?
  3. Corsair 620-HX
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