What is a "res" on board pinout?

I have an MSI 865PE motherboard, running an Intel chip. I put this together in April 2006, and it's been running fine ever since. Today when I booted up, I didn't! No power to anything. Took out my power supply and went to a local computer shop, which tested it and said it was shot. Purchased a new Thermaltake TR-2-500W power supply. Brought it home and performed the 'out-of-box test' in the power supply manual, and it worked fine. Installed it into the tower and hooked everything up, and the "stand-by" light on the power supply comes on, but nothing happens when I hit the power on switch. Checked all my connections, and nothing seems strange. Compared the pin-outs between the motherboard and the power supply, and everything matches up, with these exceptions: pin 12 on board is a no-connect, while +3.3v is put there by the power supply; pin 8 is termed "PWR OK" on the motherboard, but termed "PWR_ON" on the supply (which could be the same thing?); but the one thing that's very strange to me is that pin 20 is a no-connect on the power supply--but is termed "RES" on the motherboard. My working assumption is that the motherboard wants some potential at pin 20, but the supply is not putting anything there. Any suggestions, or can someone define "RES?" The power supply I replaced was a 430W, ATX 12V, and the Thermaltake is a 500W, ATX 12V, so I don't see any problem with the supply. I phoned the local shop back and he said he didn't know anything about MSI boards, but that as long as my motherboard wants an ATX form factor, it should work with no problem. Any suggestions would be appreciated. Thanks.

Check the case mounting standoffs to verify that they are lining up correctly with the mounting holes on the motherboard.

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Quote
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+5v = 20a
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If a forum member gives an answer you like, give them the Kudos they deserve. If a member gives you the answer to your question, mark the answer as Accepted Solution so others can see the solution to the problem.
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0219577,
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What is a "res" on board pinout?

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