Could Micheal have been imagining that he was speaking to Walt?

When Micheal first looked at the computer, he is looking at a blank screen. When Michael tries to type on the computer, he is not able to. ( remember, the computer only allows you to input the code. Nothing else)

Michael seem to have recieved another message from Walt, right before Jack walks in. Micheal seems to have been a little bit jumpy, and it seems like he was afraid of jack. When Jack looks at the computer screen, it was once again blank.

Did anyone else notice that the the two times Walt spoke to Micheal, he did not once mention his dog? yet, his dog was the first thing he mention after the plane crash?

Also, could imagining this, be a symptom of the illness?

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