Last week, I got in touch with root, recovery, custom ROMs and stuff aaaaand... then I got an error in KDZ and bricked my phone (stuck at emergency mode). For about 3 hours I had an expensive paper-weight. I just stayed calm (well, not THAT calm, but...) and after almost 3 hours of searching and trying all the possibilities of 'unbrick methods', I succeded.
Give us more details and you may not need specialized service to fix your phone.
- When you plugged your phone showing 'emergency mode', did your computer recognized it in some way?
(with 'recognized' I mean if Windows make a sound of 'device connected' and/or some lg modem appears on the device manager of Windows)
To me, it was recognized only after I removed the battery (thus making my phone in emergency mode turn off) and connecting the phone trough USB without battery. From this point, I just flashed a stock ROM with KDZ but, instead of selecting DIAG, I selected EMERGENCY.
If your phone gets recognized, remember to have the LG modem disabled like in any normal usage of KDZ
Now my phone is OK and I used KDZ many other times successfully.
(If you haven't seen already, it's very easy to find guides to unbrick the P500 - search this forum or google it).
If you're not sure you will be able to fix your phone anytime soon, keep it powered off to save the battery and give us more details about your problem, until you have in mind a possible solution.
You have a big chance of fixing your phone if it's only a software problem.