If it won't charge there may be a problem with the battery, but it should still work on the adapter.
More information is needed to troubleshoot this: is the damned thing starting at all? Do you see lights come on, hear a fan or is there no effect at all when you press the power switch? If the latter, the BIOS isn't the problem. There could be a problem with the wall adapter or the AC jack.
If it starts but doesn't boot, does the machine display a message? If so, what message?