Help: a670 Freezes on Startup

Hey, I've tried to search for this and looked everywhere, including Google. My phone displays the verizon animation, but never gets past the animation and just freezes on the logo. Then, the only thing I can do is rip out the battery. Everything was working fine until one of the times I was transfering a wallpaper, it did this upon restarting. I tried deleting said wallpaper, but that didn't help. My phone is also out of warranty, so I can't just take it back to the store. However, if I let it get into charging mode, I can access the filesystem through bitpim. What are the steps I can take? And please, if you tell me it's been posted numerous times on this forum, could you give me a link?