Did you try:
Settings > Setting security > Settings > Restore Factory + phone code.
This will erase ALL your data on phone, so do a backup copy first!
SOURCE: k800i sony ericsson not switching on
your phone software program is damage or over DL'
the best way to do is bring to the nearest Cellphone repair shop' and re-program it' special gadget and software is needed...:D
SOURCE: my sony ericsson k800i phone has a problem with signals
hello
the problem is with your phone's hardware
SOURCE: no network coverage sony ericsson k800i
how can get net work coverage in k800i sony ericsison mobeile phone
SOURCE: i cannot power on my Sony Ericsson K800i phone. i
are you sure there is power in the battery?
If you do, try to dismantle the battary and put it back again after 10 minutes.
That will do the trick
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