I just installed a Diamond Radeon HD 5550 on Dell Dimension 9150, on which I had a 60GB SSD Running win 7 32 bit. First install the card worked and performed like a dream. After a shut down and 40 minutes later restarted it and the display goes crazy in about min of start. I have re-installed the HD 5550 catalyst and and changed to another HD 5550 but the problem remains. Any ideas if it is the 32 bit version of win 7 causing the problem or the mother board not good enough. Thank you for your help...