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I saw same problem with most of HP laptops (almost all series of dv-xxxx) this is the problem of nVidia graphics chipset, you have visit any service center to fix this problem,
Do not buy or recommend HP dv series laptops with nVidia chipsets
please vote if found usefull
This is what i would do is take a external monitor and plug into the side. If that works you have ruled out the mother board. Then it is down to three other things the cable could be bad or the LCD itself or the invertor. I would check your cables first and make sure they have a tight fit not being pinched or a screw going threw. I would try the invertor last bc that's the rare part to go bad. I would buy the cable and a new LCD panel but make sure you can return the part you don't need.
I assume you want to know how to replace touchpad.
easy precedure but best bet is to download service manual from hp site for strip down preecedure http://www.hp.com
or you could use a usb mouse or usb trackball
Try booting, hit F8 for the list, go to safe mode but right after you hit enter to go into safe mode hold the left and right <ctrl> keys. That loads minimal amount of drivers as possible. Do you have you Win XP disk in case a repair is needed? Let me know what happens.
Only mobo's available for it are that series and no other. It is a service/sales issue to get you to buy a new laptop. The other units in the series probably differ in onboard video and processor capability. The case in only built to accomadate theat board and display.