The graphics on my iq504 are grainy (pink lines every other pixel)

ive had 3 different iq504 touchscreen PCs and each one of them did this the first one the problem just went away after a while but this on ( the third replacement) has had the pink lines in it for over 3 months and after messing with it the whole screen started wigging out. the comp works fine you just cant see whats going on on the screen. has anyone had this problem?
i go to electronics school at WTI (great school) and even those guys couldnt find a way to fix the pink lines. they did fix the screen wigging out (imagine trying to watch pay per view that is still scrambled) but the graphics are still diced up by vertical pink lines.
HP wants $300.00 for me to send it to them to find out what the problem is and then i have to pay for what ever it takes to fix it.
no way!!!!!
the instructor who teaches students how to put computers together couldnt find the video card (in the comp or on the internet) so i dont know what else to try it seens like a settings or refresh rate problem but theres no option besides 60Hz so i cant change it to find out
if anyone knows where i can go to find hwlp i would really appreciate it.
p.s. solid colors arent effected buy the pink lines but even the mouse arrow has the lines in it as well as every picture or movie

I am around 4 IQ50x models and none of them have shown vertical pink lines. Generally, large bands of pink going across an all white screen indicates CCD failure in the backlight
Your instructor could not find the video card in your TouchSmart because it does not have one. The video hardware is integrated into the motherboard.
The LCD panel is designed to work at 60Hz and you should not change it... as you might compound the problem.
THe notive displau resolution for this model is Resolution 1680 x 1050 @ 60Hz. If it is not set to this resolution, please do so and let us know if the pink lines go away.
You mention the lines do not appear over solid colors... Do they appear on the initial HP logo screen? The Bios Setup Utility? The boot Recovery Screens (press F11 repeatedly at startup but cancel if you don't want to fully recover your software). If the lines do not appear is there any sort of video control software that you have added to each TouchSmart.. some common software that you installed onto each one.
... an HP employee expressing his own opinion.
Please post rather than send me a Message. It's good for the community and I might not be able to get back quickly. - Thank you.

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