Black Screen - "Mainboard Problem". Please help me out!
please help me fix this laptop.
after power on everything works but nothing shows up. some times after 10 or more power on finally it gives the display. but after a restart it dies again.
i have tried this:
-connected laptop to a monitor through VGA output, but nothing showed up.
-i removed ati graphic chip from the main board using hot air gun in order to force the laptop to use cpu graphic. and still nothing shows up.
-cmos battery gives 3v properly.
-i replaced cpu, ram and hard disk.
and now out of hope i'm seeking international help and advise. - Please help me out!
i have a multimeter, can someone tell me where should i look???