iPhone 4 won't boot, apple logo flashes on and off!

[Kellyfelly]

Hi, my friend gave me his iPhone 4 to jailbreak for him. When I plugged it in to my pc the apple logo came on for about 4 seconds and went off for 3 and back on again for 4 etc, so i unplugged it and tried to switch it on but it wont work so I tried putting it in to dfu mode and restore and update in iTunes, I tried jailbreaking it with (4.3.3) the new redsn0w and it came up on the iPhone screen and said downloading jailbreak files and the a bunch of White writing came up and the phone rebooted and did the apple logo thing again. Please help.

[Tabor]

It sounds like a successful jailbreak did u look foe cydia?

[Kellyfelly]

It sounds like a successful jailbreak did u look foe cydia?

how can I check for Cydia if the iPhone won't start?

[Stray]

it also seems like you are in a bootloop. try to restore it and jailbreak again

[Kellyfelly]

I have tried 4 times to restore it via iTunes and nothing, I have tried to jailbreak it as well but nothing. How do I get out of this bootloop?

[Stray]

what happens in itunes?

[Kellyfelly]

what happens in itunes?

I get error 3194

[Kellyfelly]

And I tried the editing the host file too.

[Stray]

are you still trying to restore to 4.3.3 and do you have tinyumbrella installed?

[Kellyfelly]

Yeah I'm trying to put 4.3.3 on. I have tinyumbrella.

[Kellyfelly]

So am I getting any more help?

[Keithw67]

I have the same problem, when I plug my 3GS into my pc the apple logo comes on for a few seconds and then goes off again and this just repeats..... On offs, on off no matter how long I leave it pluggen in. When I unplug it it won't turn on. Can anyone help. Thanks