So about a week ago my Blackberry (8900) booted to a screen stating “Error [some number I can’t remember]:  Reload OS”, obviously not good.  So I broke out JLcmder (a must have for all hard core Blackberry hackers), and proceeded to wipe and OS and reload my BB.  Yesterday afternoon I am sitting at my desk and I look down at my Blackberry and it is sitting there with a white screen, nothing but a white screen.  I try a soft reboot, and back to the white screen, I try a battery pull, back to the white screen.  Then in not my finest moment I some how rationalize that running over to the T-Mobile store will be the easiest/quickest fix, they waste a solid 30 mins of my life pulling the battery repeatedly and praying that it will boot, I will never get that 30 mins back.  As usual I returned to the office hooked the BB up to a laptop to see if I could connect from JLcmder, no luck.  I removed the battery, sim card and my MicroSD memory card, replaced the battery and rebooted, my BB returned.  I then stated scouring the forums, turns out that a few others had seen an issue with a corrupted SD card that caused the white screen of death.  Last night I formatted my SD card (fat32) and placed it back into my BB and the phone booted fine (happy about that).  When will I realize to never call my carrier for technical support (I have been with Verizon, AT&T and now T-Mobile and they are all the same. When you go to a BB specialist and the first thing they tell you do is pull your batter, you have to wonder how special he or she is.)  Hope this helps someone.