Hi Marty.
Your question is real vague.
First of all, I've never heard of a Micron computer.
When it comes to repairing keyboards, the usual solution is to replace them all together. They are cheap.
Because I have no idea what condition the key is in, how it broke, or what parts may be damaged, it would be impossible for me to tell you how to fix it don't you think?
However, I can tell you that you should be able to buy a replacement keyboard for the computer for around $20-$30. However, this being an "unknown" brand name it might be hard to find a keyboard to replace it with if it is something obscure.
Ebay is your friend in this case.
There is a machine selling for $19.99 (USD) and another for $39 (USD) that may have what you need.( just click on the items priced at (GBP) £12.06 or £24.12……one's a "Buy it Now" price Please note neither me nor Whatthetech are recommending the items on ebay……..please be careful ….and make your own enquiries. and ensure that any items you buy are "fit for purpose" electrically safe and in all respects suitable for you.
Regards
paws