Bad Power Supply?

[TrollFace]

I'm building a new system with a Gigabyte GA-P35C DS3R and an Intel 6750 CPU. The trouble is that I can't get the mobo to POST or beep. I turn the power on, the CPU fan starts, and nothing else. I sent the mobo and CPU back, got new ones, and still the same problem. The only thing that's the same from the two tests is the power supply.

I've only seen one bad power supply, and the whole power supply was bad. Has anyone seen a power supply with a bad wire?

Any help or suggestions is greatly appreciated. Just understand that I'm not new at this. This is my third personal computer build from scratch and I built computers professionally back when they were PCs (That was 1986. Man, I'm getting old).

 

[robisbell]

not a common thing for one wire to short out or snap inside. I'm checking out the board and cpu compatibility.


what revision is the board?

 

[mechBgon]

A full spec list, including the brand & model of the PSU, could help shed light on what the problem is. Specs?

Referring to this pic of your board, do you have the 4-pin CPU power connector (shown at the lower left) connected? If your video card uses a supplemental power cable, is that connected too?

 

[TrollFace]

Compatability? The CPU went right in with only a small amount persuasion from a hammer and screwdriver. Obviously, it's compatible.

Actually, I checked that out before I bought the parts. The manufacturer says they should work.

The original board was version 1.1. I'll have to find out the version number for the new board later.

 

[TrollFace]

The PSU is an 8800 GTS with 320 Mb of memory. I tried starting the system with and without the PSU, and no beep.

A CPU power cable? When did that get there? Apparently I did not follow my checklist: 1 - Set up system. 2 - Fail. 3 - Read directions.

At least I did connect the extra power cable to the PSU.

Thanks for your help. I'll let you know what happens in round 2 tonight.

 

[robisbell]

sorry, I thought you wanted help. I'll leave you to your snide comments.

 

[TrollFace]

My apologies if that came across wrong. It was only a poor attempt at humor.

 

[robisbell]

well, on the board itself is a version number, if you get me that I can help.

 

[mechBgon]

Originally posted by: TrollFace
The PSU is an 8800 GTS with 320 Mb of memory. I tried starting the system with and without the PSU, and no beep.

PSU stands for Power Supply Unit. I want to know if your power supply is a good-quality one that definitely has enough well-regulated wattage to run the show, basically.

 

[oynaz]

Bad RAM maybe? Though usually that results in an error code of beeps.

 

[siskel77]

Check the position of the Clear CMOS jumper. Sometimes mobos come with them in the clear position, and this will prevent you from achieving a POST. Other than this I would try configure the system with as few parts as possible and try again.

 

[TrollFace]

Thanks to everyone for your help.

The problem was the CPU power cord. I attached it and everything worked.

Here's a summary to help anyone who does a search for this problem:
After setting up the system, I powered it on. The CPU fan started running, but there was no POST and no beep from the motherboard. I stripped the system down, took the motherboard out of the case (in case of a short), removed everything but the CPU, power, speaker, and power on connections. Still no beep or POST.

The solution was to attach the CPU power cable, or basically "Read The Fine Manual".

 

[mechBgon]

That's good news Enjoy!

 

[robisbell]

glad it is up and running, when you say CPU power cable. do you mean the ones from the PSU to the motherboard or the one from the electrical outlet to the PSU?

 

[oynaz]

I really hope it is the former

 

[TrollFace]

Uhmmm....yeah, it was the CPU power cable, of course. Definitely not the electrical outlet.

 

[robisbell]

how many pncs did this cable have?