HP DV4-1155SE Black Screen and Wont Boot. Please Help!

Hello all I am working on an Hp DV4-1155SE. I have tested the memory modules, the hard drive and everything else that I can take out of the computer easily. Everything works but!, The laptop will not boot into the bios or anything else. Black screen, wont boot and i have the bios file that HP supplies on the support page of the site. I have looked at the instructions that a few people have posted about re flashing the bios and that does not seem to help me at all with this AMD processor. If anyone can please offer any help at all this would be greatly appreciated.
Thank you!

I will search on int 19h....thanks.
My problem started before the bios-screen.
This is what I tried this evening:
- Disconnected all non-essential devices...no effect.
- Cleared the CMOS...system booted to OS!    Screens still garbled! 
- Put in an older graphics-card...No artifacts! 
- Put my MSI NX6600GT (AGP) back in...screen grabled while booting. Once in OS everything
  looks fine at first. Later I noticed some odd random pixels. Playing movies is working fine.
  Playing 3D games results in all kinds of strange looking artifacts.
- Installed the latest NVidia- drivers...no effect.
Is my problem still MOBO related or Graphics Adapter?
Any further advice?
Thanks!

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