Iphone Apple logo keeps flashing on & off?

I have a jailbroken Iphone 3gs. I did the update & from then on, my phone won't turn on. The logo will flash on for 10 seconds and then go off again. It has been doing this nonstop for the past 2 days. I've tried the holding the home and sleep button method and I've put it in recovery mode and it didn't work. I connected it to iTunes and tried restoring it, but with about 30 minutes left of the upgrade/restoration, the apple logo kicked in again. Nothing seems to be working, please help!

Sounds like your phone is stuck in a recovery loop due to one of your packages. What you can do is download the latest version of redsn0w and under one of the options, click on "Fix Recovery"

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