IPhone 3G won't restore

NOTE! MY IPHONE IS JAILBROKEN AND UNLOCKED!
Ok so today I was playing music in my office through my iPhone in a boom box. I turned the volume down to make a phone call and didn't notice the music had stopped. A few minutes later a co-worker put his iPod on. After I got off my call I went to switch mine back on. I turned on the screen and saw the apple logo thinking "oh great it crashed again" and that I just had to wait, but then the "connect to itunes" screen came on. I connected my iPhone and tried to do a restore but it failed. I tried again, same thing.
I then began googling how to fix this issue. I tried sn0wbreeze, tinyumbrella (wouldn't even load), iFaith (said my device was unsupported), put it in the freezer for 30 mins (in case it was over heated), added a host and set it to DFU mode (black screen mode?). I attempted many restores following many different types of directions. I keep receiving different error codes and nothing is making it load. I'm really worried my phone just killed its self but I continue to only get the "apple" and the "connect to itunes" screens. I need this fixed As soon as possible! Please I need serious answers and help. Thank you so much!

Added (1). I'm honestly not sure if it's tethered or not because I wasn't the one who jail broke it. But I BELIEVE it is tethered.

Is it tethered?

Take it easy! Taken it to the customer service department and repaired it

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