I'd remove the battery if i'ts low. It can conceivably hang the boot, and it can -and will- corrode the PCB. Since it's under voltage, it can't be doing you any good, and it can be doing harm.
Other than that, I remember there being some CMOS associated with the bootup, but more than that is too much for me to remember.
Jim Fabiano might be able to fix it, but he most likely doesn't do remote hand-holding, since he makes his living by repairing the stuff himself...
Keith