help for galaxy s3 gt-i9300 please

Hello such friends, I am new to the forum and I've heard good things about you and support they provide, and do not know where to find help and where to introduce ask disculkpas not to, so I've come to ask for help here. I have a Samsung Galaxy i9300, the problem is that the phone does not start, when I turn out the logo not only a blank screen with horizontal stripes is placed and remains so, there is no way to enter the mode where buttons collapses On menu and vol + + + but when put on menu and vol- enters download mode and you see everything clearly so it is not display, you connect to Odin and the computer recognizes it but when loading the rom and give in ok for flashing I get fail and said "there is no pit partition" according lei you go down the pit partition and give approval to the box that says re-partition but nothing stays there and does not move forward at all, please i need help I am desperate! I have no phone warranty so that's not an option..

I apologize if I made a mistake but I'm new to this forum and other country, I'm sorry, I hope soon familiar with this forum.
Thanks for your patience

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