I think everyone is jumping to conclusions here...let's start with the basics: What exactly is the computer doing when you try to power it on? Does it chime? Is the screen black, or solid white? If white, have you held down the option key while powering on to see if it gives you the option menu? Have you tried resetting the PMU (hold the power button in for 10 seconds with the AC connected until you hear a tone)?
I'd remove the battery, extended RAM, and Airport card, just to rule those items out before you start testing.
Often the clock can show a wrong time if a laptop's battery is fully dead and the laptop sits with no power for a while. In other words, it has no power source in order to maintain the time. That's pretty normal on iBooks, and not a reason for alarm...I see it every day, and when you restore power and connect to the Internet, and reset the time, everything should be fine (as far as the time goes).