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Old 11-26-2007, 10:29 PM   #1 (permalink)
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Default PSU and MOBO not compatible?

Hello, i'm building my new system but i've run into a problem. On my Gigabyte GA-P35-DS3L i have a spot for a 24pin ATX Power connector, but my Coolermaster Extreme Power 650W ATX 12V V2.01 Silent Power Supply 20/24PIN 120MM Fan only seems to have a 20 pin connector. There is a seperate 4pin connector, but i think it's supposed to go in the separate 12v atx connector by the CPU. Did i get the wrong PSU, or am i just not doing it right? I tried connecting the 4 pin to the remaining 4 pins on the 24 pin atx connector on the mobo, but the computer didn't boot up. All the fans spun, but the hard drive only spun for abot 1/4 a second. Couldn't even get into BIOS.
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Old 11-26-2007, 10:31 PM   #2 (permalink)
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Default Re: PSU and MOBO not compatible?

The 20 pin and 4 pin connectors should connect together some how, and go into the 24 pin slot on your motherboard.

Sounds like you had it right when things 'almost' booted up.
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Old 11-26-2007, 10:33 PM   #3 (permalink)
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Default Re: PSU and MOBO not compatible?

Then what do i connect to my 4pin 12v ATX? It's a totally seperate connection beside the CPU.
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Old 11-26-2007, 10:44 PM   #4 (permalink)
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Default Re: PSU and MOBO not compatible?

From what I can tell, that power supply has both the +4pin addon for the 20pin connector, as well as another 4pin CPU power connector.

Is this your Power Supply?:
Newegg.com - COOLER MASTER eXtreme Power RP-650-PCAR ATX from factor 12V V2.01 650W Power Supply 115/230 V Safety Nemko, TUV, cUL, CE, BSMI, FCC, CCC - Retail
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Old 11-26-2007, 10:56 PM   #5 (permalink)
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Default Re: PSU and MOBO not compatible?

That is my power supply...i got it booted up, i just missed the 2nd 4-pin connector. I guess that's what happens when you don't carefully separate all 5 bajillion connectors. Thanks for the help =)


Does anyone know of any issues with USB devices not being recognized upon bootup? I can get to my desktop, and everything is peachy, but i can't use my mouse, keyboard etc
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Old 11-26-2007, 11:31 PM   #6 (permalink)
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Default Re: PSU and MOBO not compatible?

For some reason I'm thinking your problem is a bios setting... can't be sure though.

Good to see you got your PSU problem sorted out... I'd be pretty annoyed if I had bought an incompatable PSU on accident.
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Old 11-27-2007, 12:23 AM   #7 (permalink)
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Default Re: PSU and MOBO not compatible?

With those boards you have to go into the BIOS and enable USB keyboard and mouse support as aether stated.
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