After I restore the original factory settings on my phone it never came to life again. I can't do anything even if I try to press the restart button NOTHING is responding. Please Nokia help us on this I already convinced most of friends to get this phone now I'm feeling a bit embarrassed that they will experience such things.
Try removing your battery for a few minutes. After putting it back, press and hold the power button for about 5 seconds.
If it still does not switch on, take your phone to your nearest Nokia service center to have it looked at.
"Try not. Do or do not, there is no try."
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If your 5800 already had software version 20 software, you could also try the three-fingered suicide: