What is those Watts on the PSU (Power Supply Unit) open the side and find out, The PSU should be at least 350w with that system, prefurably 500w. in contrast a midrange Gaming system like mine needs 550w min, So I have 750w for expansion. But typically High end and extreme Gaming systems needs 750w to 1500w, remember the PSU could be outta date, Wheather is a gaming system or not it should have all the right connectors, Like 24 Pin Mobo plug, 8 Pin CPU Plug, 6+2 GPU Cables, 4 pin floppy (yes we don't use floppies anymore, but one is still always included for some reson, even a decade later), 4 pin Molex plugs (yes we don't use PATA Disks and Drives anymore, but several is still always included for some reson, even a decade later) and 15/16 pin Sata Power cables (those replaced the 4 pin Molexes). if any of these aren't on your PSU, buy a new one. Don't bother using adaptors they cause more problems and only go so far. Cheaper and easier to buy a new PSU, Yours may already be cactus.