phoenixrising2015
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nForce 680i SLI shuts down (power off) during boot (20 to 40 seconds after power on) I originally had a error code "--" on the mother board LEDs, I determined it was the power supply (with the help of HeavyHemi and this form) , Changed the Power Supply (Installed a Corsair RM550x) and the system boots past the "--" code, but now it shuts down / powers off at random times during the boot. I have the boot pause on Floppy disk error, so it will go to the error and wait for the F1 key. The MB Leds are at 7F. Then in a few second it will power off. I thought it might be a CPU heat problem, so I resealed the CPU Heat Sink - did not help. I cleared the cmos and am running with just one stick of memory and the hard drive installed. Any ideas on this one? Could my new Power Supply be bad? Part Number - 122-CK-NF68-T1 Serial Number - 7072682915441 Thanks Larry
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bcavnaugh
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Re: nForce 680i SLI shuts down (power off) during boot (20 to 40 seconds after power on)
2019/07/28 07:13:49
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Thermal Shut down by the CPU maybe or Dead CMOS Battery. "resealed the CPU Heat Sink" did you replace the Thermal Paste when you did this? Bad New Power Supply or maybe you used the same cables from your Old Power Supply on the New Power Supply and it killing the Motherboard.
post edited by bcavnaugh - 2019/07/28 07:17:26
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phoenixrising2015
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Re: nForce 680i SLI shuts down (power off) during boot (20 to 40 seconds after power on)
2020/02/29 06:53:39
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Hi Sorry for taking so long to get back to this project,
In answer to bcavaugh post, yes I did replace the Thermal Paste when I resealed the CPU heat sink. I also just purchased a new 700 watt Power supply with new cables and all. Still the same issues, however, I believe it must be heat related because when I first start the PC in the morning it will run for about 30 seconds, then subsequent power-up will only run for about 5-10 sec until I let it sit again. I used a product called NT-H1 Noctua thermal paste for the CPU to the heat sink seal. Is that a known good product for thermal paste? Is there any way to monitor the CPU temperature or dose it log it somewhere?
Any ideas on what to next would be helpful,
Thanks
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rjohnson11
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Re: nForce 680i SLI shuts down (power off) during boot (20 to 40 seconds after power on)
2020/02/29 08:05:18
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If it is not a heat related issue then I would believe it is a motherboard issue. Luckily there are numerous 775 motherboards available on auction sites for very little money.
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Cool GTX
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Re: nForce 680i SLI shuts down (power off) during boot (20 to 40 seconds after power on)
2020/02/29 10:20:48
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☼ Best Answerby Cool GTX 2020/03/02 09:22:50
phoenixrising2015
Hi Sorry for taking so long to get back to this project,
In answer to bcavaugh post, yes I did replace the Thermal Paste when I resealed the CPU heat sink. I also just purchased a new 700 watt Power supply with new cables and all. Still the same issues, however, I believe it must be heat related because when I first start the PC in the morning it will run for about 30 seconds, then subsequent power-up will only run for about 5-10 sec until I let it sit again. I used a product called NT-H1 Noctua thermal paste for the CPU to the heat sink seal. Is that a known good product for thermal paste? Is there any way to monitor the CPU temperature or dose it log it somewhere?
Any ideas on what to next would be helpful,
Thanks
Have you ever changed the CMOS battery ... that is an older MB ... at a minimum inspect the battery Could be a bad MB or CPU ... Also to eliminate the GPU ... try using a spare, GPU if you have an old one Try different KB & Mouse in different ports Disconnect ALL connections to the Case & any extras connected to MB like: serial, external USB, sound, printer port ..... Remove HD ... BOOT to BIOS screen - does it still shutdown ? Still no go ? --> Time to test - pull the MB from the case ...give a careful close look over place MB on not conductive surface .. cardboard works 1 RAM, Cooler for CPU, GPU, KB & PSU ... will it BOOT try PS2 & USB ports EVGA nForce 680i SLI manual still not working - pull CPU & inspect the socket pins for damage. uneven or over tightening the CPU cooler can cause pins to be out of location or damaged. Pins look OK .... MB issue is the most likely cause
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phoenixrising2015
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Re: nForce 680i SLI shuts down (power off) during boot (20 to 40 seconds after power on)
2020/03/02 07:57:29
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Well, sometimes the problem is right in front of your eyes.
Upon inspecting the Mother Board I noticed that one of the CPU Heat Sink posts was not properly seated in the Mother Board.
I removed the heat sink, reapplied the thermal paste and properly seated the heat sink -- System now starts and runs great !!!
Thanks for all the help and ideas, this forum is very helpful.
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rjohnson11
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Re: nForce 680i SLI shuts down (power off) during boot (20 to 40 seconds after power on)
2020/03/02 08:34:49
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phoenixrising2015
Well, sometimes the problem is right in front of your eyes.
Upon inspecting the Mother Board I noticed that one of the CPU Heat Sink posts was not properly seated in the Mother Board.
I removed the heat sink, reapplied the thermal paste and properly seated the heat sink -- System now starts and runs great !!!
Thanks for all the help and ideas, this forum is very helpful.
An outstanding troubleshooting. A lot of people probably would have missed that. Your 680i motherboard lives on!
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Cool GTX
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Re: nForce 680i SLI shuts down (power off) during boot (20 to 40 seconds after power on)
2020/03/02 09:23:35
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Glad you found the cooler issue after closer inspection 
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XrayMan
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Re: nForce 680i SLI shuts down (power off) during boot (20 to 40 seconds after power on)
2020/03/09 19:40:23
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My Affiliate Code: 8WEQVXMCJL Associate Code: VHKH33QN4W77V6A   
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