My iPhone 3gs won't turn on - 1

I had this iPhone for a few months, And yesterday it turned off. I tried turning it on but i wouldnt go past the apple sign. NOW It won't do anything, The screen just went black and occasionally a yellow screen pops up. It won't connect to iTunes, Won't turn go to DFU mode, And i tried holding both buttons but it didn't work.

Try to restore it from your computer. I had the same problem with my iPod touch and after I restored it it worked… Make sure you back up everything

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