[psiphi]

Souinds like its time to replace the phone... Still, (with the battery out) slide out the keyboard completely and press every key several time to make sure none are sticking... do the same with every button around the outside and on the front of the phone... Clean the screen carefully but firmly... Finally, put the battery back in, plug in to power too via the USB and then try turning on... Hard Reset and Flash to a Stock ROM and hard reset again if necessary... If it still fails, you probably have a hardware fault...