Ive just installed some software onto my Nokia 7650, and screwed it up. The phone wont turn back on, i just get the Nokia logo, and then it turns itself off again. Can you please help me!!!

What program did you install?
Do you have enough battery left? that has been a answer to this question
many times :D It takes a lot to start the phone.

Ooopss! DEJA VU. I had the same problem. Try to switch the phone off, put in the charger. If it chargers press *#7370* and format your phone. You will loose all your data but the phone will boot up again. If this does not work, then you have to take it to an NSC!

yup

i had the same thing happen

left it charging overnight and its been fine ever since