I replaced my video card but my power supply couldn't push it. So i went and bought a new power supply but it wouldn't fit in because the original was mounted down. I called the manufacturer for my computer to see if they had a power supply with higher watts that would fit but they said no. They said any power supply will work but i dont know what to do. My computer has a very nice cooling system and a dont have the original system restore cd. I was wondering if there is a power supply that is close to the specifications of the Model:DPS-400LB A REV: 04. I was looking for a power supply from 450-600 watts