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I do not think error 21 is a bios error I think its a dash error... What kind of chip do you have?
Create a xbox install disk,(you gonna need to read up on this go to the tutorials and the one that says install evox without connecting box to pc) put it in and it should load up either boXplorer or xcommander(whichever u choose)
If you do not with to create a xbox install disk like this you can just make one with evox on it and then ftp the files to the xbox. Then install evox manually.
Seeing you use slayers you probably havent learnt much about the box as slayers is the easy way out and you wont ever know whats going on... Use slayers after you get it and do it for yourself first.
Sorry if im wrong im no pro and i havent experienced error 21 b4...
Ok Ok if your xbox doesnt read discs then I was wrong and error 21 isnt fixable by install disc...
If so its an error where your xbox will crash because of something.. I just dont see how it can be a bios related reason as you used slayers unless you tried to flash the bios or something? But if this is so you will need to reflash your chip externally, simply because you wont be able to do anything with a disk..(coz if the above doesnt work then you box wont read disks...
