Hook up an external monitor to determine if you have a motherboard or LCD problem. If the external monitor works, the trouble is with the display or its cables. You should also confirm that your memory is properly installed, and you may want to replace your BIOS battery. Good luck.
If the phone displays the message "personalization code blocked", then the phone is blocked due to too many wrong unlocking attempts. I recommend you to contact the service provider or visit the site Unlocking4U.com and contact them about your issue to fix it.
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