Dell Inspiron N5110 :: Won't Turn On / No Beeps Or Blinking Lights

My Dell N5110 is about 14 months old - Windows 7, 650GB HD, 8GB RAM (originally 6GB before I upgraded the memory chip). Up until about 2/2/13, I was able to turn it on, put it in hibernation, etc., but suddenly, I could not turn it on (I had it plugged in overnight, perhaps it was in Sleep mode). I saw no lights, no beeps, no black screen as described by others - just empty screen, no power, nothing.

I waited over a week before I decided to bring it in to get service (my schedule didn't permit me to do so earlier). In the meantime, I kept trying everyday to get it work - I removed the battery, I reseated the memory chips, I clicked the power button on for multiple times, held it down for 30+ seconds, clicked every key on the keyboard, used two different power adapters (one had a blue light to indicate that it was powered), tried to used the AC adapter without a battery, all to no avail.

Eight days after the initial discovery (and a few days before I had planned to bring it in), I tried once more - removed the battery, reseated the memory chips, et. al. and then clicked the power switch (did not use a power supply). Unbelievably, IT TURNED ON! I was so shocked that I immediately took all of my personal information right off and did not turn it off again until I had cleaned the hard drive off. I reluctantly shut down the PC and was able to restart it again! And it was working fine until just this past Friday (3/29/13) where it is now dead again. I think that it went into sleep mode as I just closed the monitor and I saw the lights go off.

I have a feeling that my machine went into sleep mode and it still "thinks" it is sleeping and it can't be turned back on. Perhaps what I saw earlier was the complete draining of the power resources which rendered the machine completely cold so it was able to restart? Was there a Microsoft service release that could have caused this to happen? I have not changed my power settings to prevent the machine from sleeping but if I can get it restarted again, I will definitely change the setting.