Dear friends i have dell inspiron n5010(dg15 mb -48.4hh01.011) would not boot up ,with this condition:
-All voltages are true,i compared any section with schematic.
-The lpc bus is active(DB1 checked with oscilloscope).
-when i opened the lap top u601( lan rtl8103t) on IO board was hot,so i removed it.
-The bios and EC file updated from vlab.ru .
-Ram and cpu changed.
Waiting for any offer plz..

Hi,reworking gpu did not solve the problem..any offer???

Hi,I changed gpu with new one but no answer,then I soldered a debugger to lpc port that shows texts instead of codes,it show "legacy option rom initialization"and stay there and no more text or cods indicates,i think system could not recognize gpu chip-set...waiting for any help ..

Try to reball chip.
It helps me

Make sure the BIOS is the right one then replace the video chip with a new one (under best circumstances).