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Hi just used odin to flash
now wont restart excep for fist power on screen with yellow triangle
im really stuck

Done that still same,,,i dont think it was rooted, before uploading the rom etc...maybe its that, best stop messing, going round in circles.Hello and welcome to Android Forums Rimski!
It is not uncommon after flashing a ROM or firmware to encounter boot-up problems. I suggest that you boot into Recovery mode and wipe the cache partition and then try rebooting...
Get Android into Restore Mode and Wipe Cache in Samsung Galaxy S2
Done that still same,,,i dont think it was rooted, before uploading the rom etc...maybe its that, best stop messing, going round in circles.
Thanks for that the phone is now running..OK. Then you need to flash a stock Samsung firmware for your phone and CSC code, via Odin. How to download the correct firmware and flash it are described in #1.7 of the Jelly Bean update - Dummies Guide