Answer to "force close on mail widget that came with phone"You may need to update the firmware. Please check at htc.com if your phone is available for upgrade. Most of the time these firmware upgrade could eliminate those problem.
Answer to "Why is my phone not working only give white screen"Hi, I assume this is related to IC/ribbon to the main board is broken.
Answer to "phone off with out my control?"Hi, there may be at least three issue regarding this symptom. (1) The charger / USB cable is not working (2) the charging port is broken (3) the battery is dead So how to troubleshoot this problem? (1) change to another charger (2) change USB cable (3) finally if none is working, change the battery. It would cost around USD $20 I've try to use hardware reset / factory reset (press Power button and the Home button simultaneously) but both step fail. Last option, get a new phone.