Default [Q] Stuck on HTC logo. The phone may be bricked.

Hi there.
The problem is that I can't turn on my phone as it gets stuck no that green HTC logo.
It all started when I installed an app from google market. The phone was restarting every time I launched the app. Eventually it stopped turning on and got stuck. Also, I tried doing hard reset and other things from HBOOT menu, but there's the same problem if I choose anything except recovery— it gets stuck. I searched for the issue on the internet. So, I decided to flash a newROM. I downloaded 2.42.405.4 — Android 2.3 (with root+busybox, installs from Recovery). Renamed it as PC10IMG.zip and put it on a SD card. Then I tried to run a recovery through HBOOT. After few seconds phone with a circle of arrows appeared and phone turned off and did 7 short vibrations. Now, I guess, it's bricked completely as it doesn't respond to my actions at all. Neither the red light in the corner after I connect the phone to computer.
I managed to get some information from HBOOT menu:
Code:
VISION PVT SHIP S-OFF
HBOOT-0.85.0013
MICROP-0425
RADIO-26.10.04.03_M
eMMC-boot
Apr 11 2011, 23:36:27
Before the issue I downloaded official 2.3 upgrade.

Some help would be appreciated, thanks