I have recently had some video issues with my HP Probook 6550b.
Basically, I have recently had the heat sink, motherboard and monitor all replaced. My ongoing issue is that now Windows does now not recognize my on board ATI graphics card.
If I install the drivers
from the ATI website it does not acknowledge that the adaptor exists at all. Conversely, under Device Manager, no display adaptor is listed.
I have also installed the 64 bit BIOS update and graphics drivers from the HP website with no success.
Interestingly, If I attach an external monitor, reboot and enter BIOS. I can close the lid, and the external VGA monitor works. However, when I then log into Windows and then try to use the secondary monitor, it does not work.
HP have informed me that as the external VGA out does work, it is not a hardware problem with the graphics adaptor.
How do I go about getting this issue resolved? Currently, all video is jittery and the brightness is sub-standard.
Thanks in advance.