I have a 2.6 GHz Core 2 Duo, 17 inch display. When I push the power on button I don't get a chime, so I don't get any display. The CD Rom drive sounds like it is ejecting a disk and thats it. Sometimes the fans will spin up but not always. I removed the main battery and unplugged it over night but the same thing the next morning. Does this unit have an internal clock battery? Is there a reset button on the logic board? This all started when I left it on for two weeks while I went out of town.