i have a cingular 8525 yesterday it fell down from my hand a bit badly.
it completely lost its display. the screen got white although it is still responding to my touch.
the phone is working but without any display.
could anyone tell me what exactly happened to it and how can i fix it.
very much appreciated.

I'm quite sure you can't fix it yourself. Try for example viewtopic.php?p=270191#270191 to view the screen on your pc and backup the data. Then either buy a new ppc or try asking the reseller whether they can fix it.