Why did the PS2 Power Die?

Okay so today I bought a PS2 that was broken. The power button lit up, but wouldn’t start up. So I knew there was power going through, just not starting up.

Before I opened it I got curious about my power supply. The guy I bought it from gave me a supply that allowed me to adjust voltages, and the polarity. I got curious and decided to switch the polarity since I was generally curious about what would happen. The light no longer lit up on the console, and so I just assumed it meant the power was cut since it was going the opposite direction now. So I switch it back, but now the console power light won’t turn on at all. I have cleaned it at this point and I’m considering resoldering the solder points for the power port. But I want to know what happened when I flipped that switch.

A PS2 has a Polarity for - o +. I switched it to + o - for only a few seconds.

I’m fixing this and someone is interested in buying it from me in a month. I want to know if I can’t fix it anymore and should order a new one to work on, or if it’s not a big deal and I can fix it.