Gateway m_285g laptop boot issues

Was working, went to replace hard drive, didnt boot, replaced original HD and still didnt boot.

seems as if the computer freezes just before the bios loads.
from an off state i hit the power button, all lights turn on processor fan starts, hard drive powers up, then lights turn off and fan stops, the power light stays on. nothing on screen, i dont hear any data being accessed on hard drive and the dvd drive dont test boot either..

i have tried the: battery in out hold power button for ever, reboot, remove bios batt for 24hours then reboot, removed memory, reseat mem, new mem.

now remember, i can not access the bios so i cant change anything.

any ideas?