I just replaced the keyboard on my iBook G3 800mhz 32 MB VRam. Looked all well and done, so I started it up, and that went smotthly. I shut it down by holding on the power button right away as I didn't need to use it right then. However, now I tried to turn it on and holding down the pwoer buttom seems to do nothing at all. Any troubleshooting advice?