Xbox one is running slow. I believe the power supply is damaged but I dont want to replace...

Have you tried putting the console back to factory reset? Follow these instructions, hopefully it will fix your issue. https://support.xbox.com/en-IE/help/hardware-network/console/reset-console-to-factory-defaults

Before you do it, make sure you remember your email and password that you use for your Xbox account.

Hello HydroTHC, My name is David. I am an independent advisor, happy to help you today.

A damaged power supply is unlikely to directly cause a slowdown in the performance of your Xbox One. The power supply is responsible for providing the necessary power to the console and if it is not working properly, you may experience issues such as random shutdowns. or inability to turn on the console. However, it is usually not a direct cause of slow performance.

However, if there are other elements that could already be beginning to fail, such as the internal disk of your console or other components, in these cases it is best to request a repair so that the problem can be solved and the console reset. . It can only be something momentary.

Best regards.

To simply answer your question, yes. That would supply too much power and would result in damage to the console. It is recommended that you use the power supply that originally came with your console when you purchased it. (if you are replacing it,
replace it with a power supply with the same rating and specs as the original one)

i believe you need a power supply replacement

Try cleaning your power supply socket. If they doesn't work your power supply is most likely damaged and need replaced.