i don't know much about computer hardware but i want to get a new graphics card, i don't know what graphics card i should get which would be compatible and not screw up my PC. i have a Dell Dimension C521, AMD Sempron 3400+ at 1.8GHz, 2.44GB DIMM DDR2 RAM. i don't know the power supply cause according to the internet that would involve me opening it up, so if you could please recommend a good graphics card (and power supply if necessary) it would be a great help

"i don't know the power supply cause according to the internet that would involve me opening it up" Why is opening it up a problem? You're gonna have to open it up to install the new video card? According to the manual, you have a 280W PSU. Unfortunately, you have a slim style case so the PSU is proprietary...that means good luck trying to upgrade. Here's the manual: http://support.dell.com/support/edo... Another problem due to the slim style case is that you will have to get a low profile video card. That will severely limit your choices & rules out high end gaming. How much are you looking to spend?

anything up to £200 i can install cards and other things but the guides i looked at said i had to open up the power supply box? so i didn't want to screw around in there

Did you understand what I wrote? Your case is a non-standard design & because of that design, you can not just go to a PC shop & buy any old power supply or any old video card. The power supply is a specific design unique to Dell & the video card MUST be low profile. The choices in low profile video cards is slim & the majority of them aren't very good. They're definitely better than onboard video but still aren't very good for gaming.

i understood completely what you said and i get it i need a low profile graphics card, i was just answering your remark about opening up a PC. and the gaming part i just need a slight boost in power really but i'd rather get the best i can