For a few months my computer has been acting up and slowing down. Programs would get stuck and recently it would shut down once in a while but fire right back up. Changed the power supply and it's like a new computer. It's not a high grade gaming machine so it doesn't need much of a power supply so I just had a generic 400 watt but I upgraded it now with a brand model 430 watt I never thought a defective power supply would slow down a computer stop programs from working, I thought it would just shut it off when overloaded.