Phone won't turn off or boot into recovery

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http://forum.xda-developers.com – I recently bought a used Samsung Galaxy S2X and it was already rooted running DarkSide's ROM. I didn't see this when i bought it but I can't seem to turn the phone off or boot into recovery mode. Whenever i hold the power button, the power menu comes up, i press power off, and then it says your phone will shut down, i press okay, the samsung galaxy boot image comes up and then the screen turns black and the soft keys stay lit...After that i can't do anything, the only thing i can do is take the battery out and put it back in to turn the phone off again. I thought this was a ROM problem, but (HowTos)