Once a long-time acquaintance called and said - a year ago you collected me a computer, could you not replace the mess with a more convenient one?
Do you read SD?
He is reading.
Do you read DVD?
He is reading.
Does not write?
Everything is written.
Hm, what is wrong?
is uncomfortable.

He brought a computer, it turned out to be a mess up the legs installed. (A system block on the table)
I turned - and the person is happy again - now you don't have to hold the disk when you insert it. He does not fall when he leaves.