I have an Acer Aspire 5315 (Vista) that will not start. When you push the power button the power light comes on for 9 or 10 seconds then goes off. I've tried with/out the battery installed. I have held down the power button for 60 seconds without any power connected/installed. I have reseated the RAM. Tried a different AC Adapter, nothing. Does the CMOS battery need changing? Nothing seems to help. Does anybody have any ideas?