Blank screen after the splash screen?PLEASE HELP ME... - myTouch 3G, Magic General

Ok so i just got my phone back from the service center....
The first time i can turn on my phone,set the setup(google sign-in,facebook) but then i turn on the phone to put the sim card....
i put the sim card,charge the phone and turn it ON....it goes through the splash screen (the htc magic logo) fine but at the lock screen it says process android bla bla bla FC...i pull the battery then turn on the phone but after the splash screen the screen went black,blue and then fade to white (Blank)
i called the service center and they email me the instruction to hard reset the phone....i hold the home+back then end call button,press the ball and then call button,the phone restart but after the splash screen the screen goes to blank....
when do the HOME+BACK+POWER button OR the BACK+POWER button the screen doesnt go BLANK,only after the splash screen....
and now i have to send it back to the service center again
Do you know why is the screen goes BLANK?is it because the ROM?they just replace the motherboard...Thanks

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