Hello all. I'm new to the forums. I have a question. I have a 2006 Intel iMac and the person I bought it from installed Snow Leopard on it, but it is giving me a hard time. The screen freezes, sometimes the screen goes black and restarts. Or the 'rainbow of death' spins after awhile...I try to reinstall SL and it freezes on me. Could it be the HD or is it Snow Leopard? Please help if possible. Thanks.