Computer

[ROBINDESBOIS]

I work on my computer
I work with my computer
I work at my computer
I mean I do some work using the computer, which one is correct?

[pjt33]

None of them is common. A BNC search for

[work] on|at|with a|the|my|your|his computer

gives a total of 8 results, of which the directly relevant ones are:

• She said she slept in it because she worked on a computer that was only available to her at night and there was no point in going...
• In other words, no one working with a computer should be forced into a straightjacket of usage...
• ...he said it was not viable to work on a computer of that age and invest in a new one...
• ...something which is particularly important for health reasons if you work at a computer.

Not really enough data to draw any definite conclusions.

COCA has considerably more results (perhaps because it uses more recent texts), and seems to favour on, at, with in that order.

There are additional complications. For example, the noted computer algebraicist Doron Zeilberger would say "with" because he anthropomorphises his computer (going to the extent of listing it as a co-author on his papers).

[wrholt]

All of them sound normal to me. There are, perhaps, small differences in nuance between them, but for the most part they seem almost completely interchangeable and equivalent.

[caliber1]

If you used any of them it would be very well understood. The only one I wouldn't use myself probably is "I work with my computer".

[Awaken]

"I work at my computer all day" sounds very normal.
"I work on my computer all day" is different. That makes me think you are repairing a computer. "I use a computer all day" would get the point across a little more clearly.

"I work with my computer all day" sounds odd to me.

[Perikles]

Yes, I agree with all that