SOURCE: My nokia 5800 won't recognise my sim card
This is a new type of phone. Your sim card might be too old for the phone to recognize it. You should go to your carrier and ask for a new sim card. They should be able to replace the old one without extra cost.
SOURCE: Nokia 5800 keeps switching off!!
Thats a manufacturer issue, only replacement of the phone itself will fix the problem.
Cheers.
SOURCE: Media problem
General system error means it's software is corrupted, just reprogram it. It cannot detect by pc because it have no identity at, just reprogram it and it will work fine, maybe it's infected with the virus while you're synchronizing with your pc.
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