Well, as SH mentioned, check the GPU cards first to see if the fans are spinning, if they have them.
If they appear to be in working order, I'd have a look at the CPU area. Get a can of compressed air and blow out any dust that may have accumulated between the fins. Don't worry about getting the dust on the MoBo or other components becasue you can just blow it away. Removing the heatsink and CPU is fairly easy. Before you do so, though, make sure you have a tube of thermal paste so you can reapply.
The heatsink will be held in place by screws or clips. You might have to remove the MoBo...you might not. Once the heatsink is off, you can remove the CPU. Wipe away any residue from the old TP from both the CPU and HS (dry-wiping is OK in a pinch, but it helps to wipe the back of the CPU and the HS with rubbing alcohol and then make sure they're both dry). Re-seat the CPU and place a BB-sized dab of TP on it. Re-attach the HSF and lock it into place, making sure it's making complete contact and doesn't get caught up on a capacitor or anything.
Re-connect all wires and fire it up. Check your temps and see if any have improved - if it was old TP that was the issue, I'm certain they will.
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