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So computer 1 didn't lie. So what does this tell you? It tells you that compter 1 is the honest computer, and hence computer 2 is the liar. So now you know that the door computer 2 (liar) tells you to choose is the WRONG door. You choose the other one.
If computer 1 is the honest one and you ask it 'what does computer 2 think is the heaven door' then computer 1 will tell you that computer 2 thinks door 2 is the heaven door, and when you ask computer 2 they will indeed tell you that door 2 is the heaven door.
So computer 1 lied. You know it is the liar. Therefore, you know that computer 2 is the honest one. So you should take computer 2's advice and choose whichever door it tells you.
If computer 1 is the liar and you ask it the same question, it's going to tell you that computer 2 will give you the answer 'door 2'. You then ask computer 2 what the heaven door is and it says 'door 1'.
Originally posted by ed 209
Like when you say 'so computer 1 didn't lie' and 'so computer 1 lied' - but you won't know that unless you actually go through the door, then it's too late if it had lied.