I bought a used captivate about 2 weeks ago off of eBay. Everythig worked great until a few days ago. I can not unlock my phone anymore. After booting it up it starts spazzing out at the lock screen. It becomes unresponsive and lights up and dims on it's own. Runs stock 2.1. Just want I can do to wipe my data off the phone because even holding the two volume buttons at start up does nothing for me. Thanks.