My phone has now had a blank screen with the apple logo for about 24 hours. I was in the process of activating it (with iNdependence 1.1.1) when it froze. I successfully Jailbroke it with no issues but the activation hosed me. I had to do a hard reset (using the two button method) and ever since then I can't get past the apple logo. Every once in a while (say 1 in 10 tries) it will get to the unlock screen but will not physically unlock. I then have to do another hard reset, etc., etc., etc.

I've tried holding down the buttons for 25+ seconds but nothing happens.

Have I completly screwed my iPhone?

connect it to itunes and then hold down the buttons

Thanks hkbloke, that did the trick!