How to reset PS2 to default?

I purchased new RGB cables for my PS2. I found an option in the system to change video to RGB output. When I did this the screen went blank. Now I can't see the PS2 menu options.

How do I reset the system back to default settings?

Well I found out, that there is not a reset option.

Can someone give me the buttons I need to push to get it off of the RGB option?

For example: Reset system, press down, X, left, etc...