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Right, the key to the puzzle is mostly just understanding what the clues around the room are telling you. If you're struggling to visualize the room, picture it as a 3x3 grid like this:

The puzzle never repeats any of the 6 placements, so keep note of each of the 6 as you go on. If you still can't figure out the puzzle, try drawing the clues as blocks that are a part of the grid, then figure out how to fit each block into the grid, overlapping any duplicate computer locations. 

If you still can't figure out the configurations, I'll put the solution below with an explanation:

The most important hint is the computer hint, which tells us the location of one of the computers directly: Seoul is in the bottom right.

The pair of papers gives us our next hint: Since New York and Queensland must be as far as possible, they must be on the corners. As the bottom right is already occupied, they must be in the bottom left and top right, although we don't know which goes where yet.

The large paper tells us that there must be a computer between Denver and Queensland, which because the bottom right is already taken, means they must be in the upper and lower left corners. Since Queensland has been mentioned twice already, we can determine its location is in the bottom left, as both bottom left and Queensland are the only two bits of information mentioned in both papers. By proxy, Denver must be in the upper left and New York must be in the upper right. 

The tablet tells us that Boston must be next to Queensland, which is easy enough, just put it as the middle left. The only name left is London, meaning it has to be on the middle right.