The power supply in the EMachines C6537 must be replaced with an ATX-certified power supply, which is the standard for desktop computers.
The power supply in the EMachines C6537 should be replaced by a power supply containing at least the sufficient recommended voltage for the most demanding part in your computer. This is typically the video card -- especially modern video cards, which demand more processor speed for smooth video performance.
The power supply in the EMachines C6537 must be compatible with the Socket 939 standard, which is the motherboard socket standard for the processor in the EMachines computer.