Redsn0w can't detect iPhone?

Trying to jailbreak my iPhone 4 (ios 6.0.1) and redsn0w just can't detect my phone what so ever. I've tried it in DFU mode (iTunes detected that it was in recovery mode but still nothing from redsn0w) and not in DFU mode and it still won't pick anything up. It's redsn0w 0.9.15b3, any advice please? D:

Are you using windows or mac? Contact me on my forum at forum.iHelpCorner.com and I will assist you further.