hp g 4 up gov

[javed]

hp g 4 up gov
boar ..... r23
prob... no display
all supply is okk
first do hpg4 dios not solved....
after i got some board and check to change bios chip i got display .......
after i take bios back up and write on other ic but other ic not sport by motherboard after i do bios on board bios chip it ok but i dont understand why dont sport other chip any bady know....