No you will need a new PSU. If you are lucky the system will be able to accommodate a standard ATX PSU. But there is a good chance it holds a PSU that is closer to the mATX size. If thats the case then you may need to get a new case for the system. For the PSU alone you can expect to spend as little as $60 or as much as $160. It all depends on what deals you can find. You will want a good quality 450W PSU or better. Something along the lines of the Corsair VX450 which offers 33A on the 12V rail will be perfect. As long as its a good quality unit and can provide more then 28A on the 12v rail(s) you will be fine.