hi i was wonderin if anyone had any advice on this issue... just yesterday my friend wanted to let me try out his videocard (ati radeon 9600xt) on my comp so that i could see if i wanted to buy it. so i took out my old nvidia geforce 2 mx400 and put in the new card. i tried to start my comp and the lights came on but it didn't work.... the screen wouldn't show. so i took out the new card and put back in the old one and it still wouldn't start. now the dvd/cd drives won't open and i'm absolutely clueless. please help. thank you.