Lost Video on the Screen

I built my own computer with parts that I bought from www.newegg.com. After 5 months running fine the screen start losing video in about 15 - 20 minutes running.
Here are my list of my computer parts:
1. HITACHI 0A38016 1TB 7200 RPM 16MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive

2. AMD Phenom II X4 945 Deneb 3.0GHz 4 x 512KB L2 Cache 6MB L3 Cache Socket AM3 125W Quad-Core Processor HDX945FBGIBOX

3. BFG Tech BFGE981024GTOCE GeForce 9800 GT OC 1GB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card

4. NZXT Performance Power PP800 800W ATX 12V 2.2V SLI Ready CrossFire Ready Power Supply

5. G.SKILL 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Dual Channel Kit Desktop Memory Model F3-12800CL9D-4GBNQ

6. GIGABYTE GA-MA790XT-UD4P AM3 DDR3 AMD 790X ATX AMD Motherboard

and the HPw1707 screen.

Can some1 help me please!
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More about lost video screen
  1. This is your PSU:
    http://www.newegg.com/product/product.aspx?item=N82E16817116007
    right? how much do you spend for this psu?

    It has 4x 12V rails, try different 6pin power connector for your 9800GT:
    http://www.newegg.com/product/product.aspx?Item=N82E16814143185

    Also check the card temps, this card is a single slot card which is produce a lot amount of heat easily, it could be an overheating...
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