i think i have another possible explanation for error 0020, through trial and error
i have the xenon version, first version, and i'm using the zephyr's or whatever's power supply.
i bought my xbox off a guy for 30 bucks cause he said it didn't read games. so whatever, i cleaned the lens with this fine cloth and suddenly it reads them. better at least. but i install to hard drive to make sure i can play them and it doesn't mess up more
well he gave it with a power supply that didn't fit, my xbox had a little stick in the middle of the power port, and i just broke it off and connected the power supply and it worked fine.
but few months later i got the 0020, some guy fixed it, two months later, that being few days ago it came back, but i seem to get past it by connecting the power supply slowly and pressing the on button until the power supply is BARELY making contact and it turns on, and well, what do you know, it works, at least for me. and as obvious as it was back then when i broke the little stick and plugged the obvious wrong power supply, i never thought it might be a reason for 0020. using the wrong power supply.
if i'm mistaken, i would still like to ask. if my xbox is meant for the 203 watts, and i'm using the 175 watts power supply, what could happen to it? explode or what? is it bad? cause well, it's been working fine, except for the 3red lights and 0020, but idk, i've had no problem since i turn it on that way.
i would like to know...how the hell did that guy end up with that power supply