Iphone 3 wont turn on..not sure if it is screen just blank have tried restoring phone but still nothing :( please help

having trouble with iphone not turning on orsomething wrong with screen have tried restoring and restting it but still nothing??

This sounds like you have tried the steps I would recommend. You said, "tried restoring and restting it but still nothing??"
1. When you are done Restoring Firmware, does iTunes show your iPhone's information. If yes then your iPhone is ON and working. Next step is to Reset, like you tried, but do it again, hold both Home and Power buttons until the iPhone restarts, usually less than 15 seconds. If still no screen, hold iPhone in bright light and look at screen, is an image there? If yes, you have a "No Backlight Problem".
2. If still no image, but you have confirmed iPhone is on with iTunes or switching Vibrate Switch and getting vibration. Then take iPhone to Apple and ask Genius to reconnect the Flex Cable #1 LCD Display Flex to the Logic Board. Before opening and during all repairs it is best if the iPhone 3GS is OFF.

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