Restor problem on MAC OSX with my iOS devices

[tomec83]

Hi Guys.
I've problem with restore my iOS devices on SNOW LEOPARD 10.6.8. with itunes 10.5.3. I've iPhone 4 (FW 5.0.1) and iPad 2 WiFi only (FW 5.0.1).
If i make restore these devices, itunes still show me error message 21.
I tried make restore from DFU mode, but i show error 1600.
I repaired permission, reinstalled itunes, turned off skype, ichat... and still the same error.
I started parallel with win XP and... restore proceed on first time, no error message
Can somebody help me? Any idea?
PLS.
I'm unfortunate

THX for your replies

Sorry for english

 

[Consultant]

iPad 2 is under warranty. Contact Apple for support.

 

[tomec83]

Sorry, idon't think that is iPad and iPhone HW problem because in parallel an other computer i can do this. I think, that problem is in my iMac, but i can't find him.