BB Curve :: Black Screen, White Screen & Reload Software 507?

I have a Blackberry Curve 8530. Several months ago, during daily use, the screen would all of a sudden go black. A battery pull would solve this problem for a while. Eventually this became more frequent. Symptoms progressed (it seemed that if I set the phone down too quickly it would reset) Finally, the phone would turn on, then go immediately to a white screen where it was undetectable by my computer. I contacted my service provider and they said the phone was toast and (amazingly enough) gave me a free loaner to use for the duration of my contract (all info transfered via an old backup, so nothing was lost) After my new phone was working I left my Curve plugged in at my office. Yesterday as I was leaving I looked at the phone again, and the screen was white and telling me to reload software 507.

I plugged it into my computer to begin the process and to my surprise the computer all of a sudden detected the phone and successfully upgraded the software. All looked great, I got past the password stage, and was just going to begin reloading my information when the screen faded to blank again. I still have the free loaner phone, so it's not a big deal, but it's bugging me as to what the problem could be. As of right now the computer can no longer detect the phone again