I bought a used Dell Latitude D600. I have talked to a tech and have asked different computer savvy people to try to get answers for this same problem. Nobody seems to understand why it won't start right up for me. I have to push the on button several times and nothing, then on other days, it turns on with no problem. I have sort of figured out by experimenting with tightening the bottom and securing any loose parts and then pushing with a little weight on the power button and any top area close to the power button (without pushing any other buttons,) it will turn on. Mine set up on a desk now and I don't move it around anymore, and it turns on every time, but sometimes I still have to try more than once. I'm convinced that it's loose parts inside that get shaken out of place when moved to another location
Good luck! I'm taking online college courses and was freaked out the first couple of times this happened to me, so wanted to let you know that it's not just your computer!
Honestly it sounds like the mainboard may be grounding on something it shouldnt, or it may have a cracked mainboard. It could be that the mainboards lamination is coming undone for some reason. Have you tried looking at the power switch itself? This particular laptop has a seperate powerboard. Try getting into the insice and make sure that the board is plugged in tight. Heres a link to the board your looking at:
http://cgi.ebay.com/Dell-D600-D500-600m-500m-power-switch-board_W0QQitemZ260481072845QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3ca5e1becd&_trksid=p3286.c0.m14
Hope this helps. If it does, rate it. Thanks...
Intermitten problems such as this are usually caused by loose connections or cables and/or components unless the component/s are intermittenly faulty. Components may not make proper electrical contact with the motherboard, especially RAM modules and may require removing build up of dust on connectors.
I suggest removing all components, clean and remove dust and reseat the RAM, the PCI & AGP cards, all the cables to the drives and the motherboard.
If all goes well you will have a stable computer that you can move around.
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