I have two Dell Inspiron 3800 notebooks and am having the same problem on both of them. When I press the "on" button, the LED's for the on/off, caps lock and scroll lock all light up for about 4 seconds, then goes off. The machines never even show the BIOS info screen. These machines have been sitting around for a while unplugged, so I suspect that there is a dead CMOS battery.
My questions are:
1) Does my guess of the CMOS battery being dead sound correct?
2) Is this something someone handy with a soldering iron could do themselves?
3) Where can I get a CMOS battery for this model?
Any links as to how to take this thing apart would be appreciated.