I have a 1300 that seems to have a problem related to power. If I unplug it from the wall (simulating a power outage without a UPS), it will not restart. When you plug it back in, the only indication that the motherboard is getting power is that the standby LED is on. The power switch won't work and the only thing that seems to get it back up is leaving it alone unplugged. When it does come up, the date and time need to be reset. Symptoms seem to point to something overheating and needing to cool down or the battery may be failing.

The motherboard has recently been replaced and it's done this since the replacement. Any thoughts or clues? Thanks in advance.