problem with scan lines from GF4 on HP computer

[ZippyDan]

got two new HP computers from a deal from hot deals forum. both computers are identical save for one is an Athlon XP 2400 and another is an Athlon XP 2600

i swapped out the HDs on both and put in a 7200rpm 40gb WD on both, and installed WinXp from scratch

put a GF4 4200 64mb in both of them

they are each on different monitors (one an envision, the other a viewsonic).... both exhibit terribly annoying scanning lines or something... horizontal lines that are running down the screen one after another very quickly... dozens of them on screen at once... it looks like an old interlaced monitor or something

changing resolution does nothing, and changing refresh rate in display options does nothing, except to perhaps make the lines go faster, or appear smaller and closer together

one of these same video cards was previously in another system and worked fine

ANY suggestions to fix this would be GREAT

im runnin Nvidia 30.89 drivers, the latest VIA AGP drivers, DX9 on one and DX8.1 on the other

another thing i noticed was that bios didnt seem to have a way to turn off onboard video, the best i could do was to choose 8MB/Auto (i suppose Auto works fine though as it probably Auto-turns-off onboard video if it detects AGP video... and since i am getting a picture...)

the computer consists of

200watt powersupply (could this be the culprit? but ive left these computers on for hours/days with no sign of instability. plus HP sells computers in these exact same cases with bigger HDDs, CD-RWs, DVDs, and GF4s! presumably on the same powersupply)
FIC AM37 Motherboard (VIA KM266 chipset)
PCI NIC
PCI USB 2.0 card
CD-ROM
WD 7200RPM 40GB HDD
Athlon 2400 or Athlon 2600
256MB DDR RAM
Inno3d GF4 Ti4200 64MB

ANY SUGGESTIONS PLZ especially from those of you out there who might have HPs

~Zippy!

 

[ZippyDan]

:/

 

[ZippyDan]

:|

 

[ZippyDan]

help

~Zippy!

 

[nick1985]

hp rocks!!!

 

[ZippyDan]

problem seems to have been the result of some inherent vid card/mboard incompatibility

i say this because of the solution:

i was using two Inno3D GF4s in both HPs and both were exhibiting same problem. both these video cards had been working fine in other systems, so it wasnt the video card's fault per se

i have two PNY GF4s also, and when i put these in the HPs, they worked flawlessly

put the Innos back in the other systems, and the Innos work fine

so obviously the HP mboard just doesnt like the Inno video cards. i know its not a driver issue because i could even see the scan lines in the bios setup... something inherent to that mboard/vid card combo was bad

you could possibly attribute it to PNY higher quality... which is probably true, but the Innos work fine in my other comps

~Zippy!

 

[Budmantom]

Well atleast you got a good deal on the puters