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What type of switch is the power button on a computer?
I don’t know a great deal about electronics, so I’m not sure what the difference is between some of the values below. So what's it's (a computer’s power switch):
contact form -> [2 Circuit ], [2PDT ], [3P ], [3PDT ], [3PST ], [4P ], [4PDT ], [6PDT ], [DB ], [DP ], [DPDT ], [DPST ], [DPST – NC ], [DPST – NO ], [SP ], [SP or DP ], [SP3T ], [SPDT ], [SPDT – DB ], [SPDT – NC ], [SPDT – NO ], [SPST ], [SPST – NC ], [SPST – NO ], [SPST - NO – DB ], [SPST - NO / NC ]
Switch function -> [(ON) - OFF - (ON) ], [(ON) – ON ], [Alternate ], [Latching ], [Maintained ], [Miniature ], [Momentary[NC ], [NC / NO ], [NC Momentary ], [NO ], [NO / NC ], [NO Momentary ], [Push to Lock ]
And what range should its contact current rating fall within?
You want a push-to-make SPST switch. ("Single Pole Single Throw" that makes momentary contact when pushed.
Most toggle switches wont due as they are either in an on or off position. When you flip the toggle on it would keep the circuit closed telling the motherboard to shut down. Example: Holding the power button down on your PC for 10 seconds to do a hard shutdown.
Remember you want a push-to-make switch which is normally open and that closes the circuit momentarily when pressed.
The power running through ATX power switch is usually no higher than 5 volts. Almost any switch that fits the bill in the other departments will do. If your feeling brave you could modify another type of switch to act accordingly.
To sum it up again you most likely want a push-to-make SPST switch.
The link below is a RadioShack model that should do the trick.
http://www.radioshack.com/product/index.jsp?numProdsPerPage=50&y=5&x=22&retainProdsInSession=1&productId=3159591&tab=summary
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 200PushButton SPST Momentary ON OFF SwitchR107A  US $72.00
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 200Push Button SPST Momentary ON OFF N C Mini Switch107A US $69.99
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 200Push Button SPST Momentary ON OFF N C Mini Switch107W US $69.99
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 100pcsPush SPST Momentary ON OFF N C SwitchBK107A US $39.99
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 100pcsMini Push Button SPST Momentary N O SwitchBK107 US $39.99
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 100Push Button SPST Momentary ON OFF SwitchR107A US $39.99
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 100pcs Mini Push Button SPST Momentary N O Switch RED US $37.95
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 PCK100 MINI PUSH BUTTON SPST MOMENTARY N C SWITCH RED US $37.95
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 PCK100 MINI PUSH BUTTON SPST MOMENTARY N C SWITCH US $37.95
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 100Push Button SPST Momentary ON OFF N C Mini Switch107A US $35.99
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 100Push Button SPST Momentary ON OFF N C Mini Switch107W US $35.99
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 100Push Button SPST Momentary Switch N O 107GA US $35.99
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 100Push Button SPST Momentary ON OFF Mini Switch107R US $35.99
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 100Push Button SPST Momentary N O Mini Switch107RA US $35.99
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 100Push Button SPST Momentary N O Mini Switch107BKA US $35.99
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 100Push Button SPST Momentary OFF ON N O Switch107G US $35.99
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 100Push Button SPST Momentary OFF ON Switch107BK US $35.99
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 100BLUE Push Button SPST Momentary N O Switch107B US $35.99
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 AIR SWITCH FOR SPA HOT TUB SPST MOMENTARY US $33.95
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 SwitchMomentarySPST Rocker1 Status LED1 GangWhite US $33.00
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 500 x Tact Switch Momentary Micro SPST NO Tactile SW US $31.49
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 PKG50PushButton SPST Momentary ON OFF SwitchR107A US $24.99
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 50 Blue PushButton SPST Momentary N O Horn SwitchB107 US $24.99
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