Well it's a start, and yeah should'da remembered that a dead PS can resemble a dead motherboard. You might be okay with the 500 W especially if it's better than the OEM.
Although if your worried, it used to be possible to buy a power supply that's just dedicated to powering a video card. Or you can get a higher wattage one & have a spare to either ebay or build into a basic system.
Although if your worried, it used to be possible to buy a power supply that's just dedicated to powering a video card. Or you can get a higher wattage one & have a spare to either ebay or build into a basic system.