My laptop has trouble starting up, even when its plugged into the mains.
I vaguely remember there being a message on startup that said something about the CMOS battery failed. The only way I get it to start is by pressing F2 when it is first turned on and then select F1 from the options offered. I don't really know what I'm doing but it seems to work for now.
I removed every screw in the back of my laptop earlier but still couldn't get the back off. I accidentally removed the hard drive but thankfully it didn't do any damage (I panicked that it might wipe everything from the memory!)
My laptop is a toshiba equium A210-171 if that makes any difference.