Help with an SL300?

I just got this SL300 but it is being as stubborn as a mule. It will only turn on if plugged in, and I don’t mean that as in the battery is dead, I mean that the only way to get it to power on is to plug it in. It will respond to the power button but it will not turn on if you press it. If you attach a CMOS battery it will not turn on no matter what, it appears that it will only turn on if the CMOS is cleared. I did manage to get an OS on it but immediately after it decided to develop a new problem where the trackpoint and trackpad both no longer work. It also likes to go to sleep at random and not wake up again, with the only way to bring it back being to unplug it and plug it back in. It is being extremely fussy to the point where I can no longer do this alone and need help with diagnostics. If you have any tips on how I can fix this nightmare, please tell me, I can’t do this alone anymore.

As for specs this unit is nearly maxed out with a GPU, 4GB of RAM, and a core 2 duo P8600.