My E510 is about 2 years old and has worked well, but now there is a power switch problem. It powers down properly, but when powering up the switch is not working as it has in the past. It flashes a yellow light for a few seconds and then nothing happens. If I come back to it a few seconds later, I've been able to get it to power up. This has happened several days in a row and I'm concerned that one of these days is won't power up at all. I'd appreciate help with this before things get worse.

Thanks,

Tom