Hi guys, I have a problem on my computer, Dell Dimension 3000, after I upgraded the new PCI graphics card yesterday. I followed the steps by step guides that came with the product, and it's working fine and good. However, when I play games online for a long time, the graphics are starting to get all messed up. I bought the nViDiA GeForce 8400 GS Graphics Card with 512 MB DDR2. Before buying this graphics card, I have been browsing the Internet about what to buy and such, but when I went to Best Buy, they told me this is the only graphics card that can work with my Dell Dimension 3000, so I bought it anyway. So my question to you guys, "Is this a good graphics card for my computer or shall i buy a better one online?" Please tell me what you think, and by the way, one thing confused me is that in my computer, there is 3 slots of PCI card slot, but when I put the new Graphics card, they asked me to replace the old one with a new one. So I don't know if I should have left it there and install the new one on the other slot since there's 3 slots anyway? Is it also the reason why my graphics card is acting all crazy? And for my last question is, "Should I get a new Power Supply for my Computer? " because I heard with the new graphics card, a new power supply is needed with at least around 400-500 Watts. But, others also say that power supply can't be upgraded easily because it is attached to the motherboard.