Iphone 3G Screen looks like "the matrix"

[delmac71]

I hope someone can help.
My Iphone 3G has crashed. When I switch it on the screen pixellates and looks like something from the matrix.
I have tried to restore it but nothing shows on screen. I have tried putting it in dfu mode but every time itunes gets to "preparing iphone for restore i get error 21.

Can anyone help?

Thanks

 

[delmac71]

Has anyone else experienced anything like this? Im at my wits end
Any suggestions would be appreciated

Thanks

 

[Squicken]

Wirelessly posted (Mozilla/5.0 (iPod; U; CPU iPhone OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5)

Pics?