Help can't start htc desire

[badescuga]

Hi ! I have a serious problem with my htc desire . I dropped it in the pool last light .. i imediatly removed the battery .. and i let it dry . This night i inserted the battery and amazingly the phone wasn't broke .. and so the recovery screen apeared ( i don't know why ) . I entered "recovery mode" and after 5 min of waiting .. it appeared on the screen " can't open update.zip " or something like that . I removed the battery and tryed again but this time it didn't work no more . I pressed Volume DOWN and then briefly the power button ( as HTC Desire manual advises ) but nothing happens except a faded short sound . Any advise ?