@ SilentKiller,
At boot-loader.com you can find original R4527_G_08.22.07R.mfw full flash and higher R4527_G_08.12.10R_B firmware version. You can try to make Repair PDS and after that Full Flash with one of those files. If that won't revive the phone then, most probably, it has some hardware malfunction.
Best Regards
Smart-clip team
www.smart-clip.com www.GsmServer.com www.boot-loader.com www.smart-unlocker.com