My sisters HP G62 was having an issue where by weird artifacts such as white lines, freezing of the display etc would occur when in use. A quick search online revealed that others had this same or similar issue caused by a damaged display cable from the display to the motherboard. Hooking up an external display worked fine.
So I ordered a new display cable from ebay and set about taking apart the laptop to install the new adapter. I cleaned out the CPU heat sink which was clogged with a ton of dust etc and applied new thermal paste. Removed the old display cable and put the new one in. However, when I go to test it I now get a white screen with occasional glimpses of windows. I connected up a external display and that seemed to work fine.
Could this be an issue with the display itself and not the cable? Or could the cable I bought be faulty or something completely different?
Also, is it normal for the laptop fans to spin up and lights to flash when I press the power button, then for everything to power down and then start up again like normal and boot? I don't remember it doing this before.