Well maybe you will have some luck at some time.
I do know that when in fastboot that the vol up is the (select) or (enter) function.
Using the power button only tries to reboot.
---------- Post added at 10:34 PM ---------- Previous post was at 10:11 PM ----------
I would look at getting to the battery as mentioned earlier.
It takes either a t4 or t5 torx screwdriver and remove the about 10 screws and the cover so you can disconnect to battery.
Ah yes. That explains it. Power button might be rebooting it again.
And yea, I'll get my hands on a torx screwdriver since I don't have one at home right now and will give an update.
I only have to disconnect and then reconnect the battery again, right?