x1900 problems/power

[Jammy]

I have just built a new system and it works fine except for occasionaly the screen goes all funny, showing just one colour e.g pink or white. It is completely random when and which colour comes up.

Every now and then the screen will go to a random solid color or a solid color with black or gray vertical lines. This even happens with low graphics processing, usually idle. I have tried connecting a different monitor but the problem is still their.
So i thought maybe my psu is underpowered, but i couldn't find any definate requirements

i reckon its either deffective or my psu isnt up to scratch


here is my system

viewsonic vx2025w 20.1 inch wide dvi
Conroe E6600
Asus p5wdh
Sapphire 1900xtx
xfi fAtality
2gb gskill 6400hz ddr2
fushion hdtv tv card
lg dvd-ram drive
250gb hitachi deskstar sata2
74gb WD raptor sata
36gb WD raptor sata
gigabyte g-power cpu cooler
x4 standard case fans
Hiper type-r modular 580w psu = http://www.hipergroup.com/English/p.../hpu-4r580.html

any help would be great

thanks

 

[Jammy]

ive currently got my mates 7800gt running fine on the motherboard, ill try and monitor the voltages, but as i said this problem occurs randomly and reuires a reboot to rectify, therefore not sure if enough time is avaliable to get the program up, i'll give it a go though