Phone Stuck on Sony Ericsson Start Splash Screen

Hello there, I recently wanted to revive my old Sony Ericsson W810i phone, so I purchased a power cord and battery only to find that the phone would startup but get stuck on the sony ericsson splash screen with the black background. When I power on the phone with the power cord plugged in it gets beyond that screen and gets to a charging screen, then if i unplug the phone the walkman animation plays and it get to the second half of the boot process (the sony ericsson logo but on a white screen this time) and then proceeds to shut down 3 seconds later. I have tried the obvious remove the battery and wait method and the hold c button method, the phone is also fully charged. Thanks, All Help would be Appreciated!