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Display problems at Boot Up (Windows PC)

When i boot up my PC the picture on my display is kind of zig zag and can move across the screen, restarting the machine normally three to four times solves the problem although the system still seems slugish at times.

I am an IT graduate and first assumed the problem may be related to my PSU which was a 550W Ultra PSU (I knew my system was pushing it to near its maximum as all online PSU calculators give me an average of 530W needed for my system although this is with everything on the system being fully stressed which it never is).

I decided to buy a new 880W Hiper PSU but I still have the same problem. I have purchased a socket tester and a PSU tester to try and source the problem but both always return normal results and say everthing is ok.

I have also played plenty of new(ish) games with all settings on max and the games play smoothly which makes me think that the graphics card is ok. BTW my Graphics Card is a His ATI X1950XTX which I know draws an awful lot of power but my PSU wshould be able to handle it seeing as two cheaper lower wattage PSU's handled it fine, even using molex to PCI-E converters.

I have run Memtest to test the memory (although I was sure this couldn't be the culprit) which is also good.

The only other hardware I have in my system is a Hard Drive and 4 Optical Drives which couldn't be the culprit.

I was just wondering if anyone has ever experienced this problem and could possibly enlighten me as to what the problem is?

Many thanks for any help recieved,

Stewart Prentice

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My problem hp 530 notebook lcd light problem ..inverter flex no problem systemboard problem yes

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