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Windows 7: Plug in GTX 260, hooked up one 6 pin power plug, motherboard wont post

01 Sep 2016   #1

Windows 7 Ultimate x64
Plug in GTX 260, hooked up one 6 pin power plug, motherboard wont post

I verified the PSU is good.
I removed all drives, all cards, even memory.
All the fans spin for a moment then nothing they stop.

I assume the MB is now destroyed? A GTX 260 has two 6 pin power connectors, since the PSU only had one 6 pin power connector, I thought to try it.

MB is Asus P5QC
So is it dead?
My System SpecsSystem Spec
01 Sep 2016   #2

Windows 7 HP 64

Did you read the GTX 260 manual to see if it has to have the two connectors on?
This is an old MB, so it has a story. Tell us how did you get it and what memory, GPU etc it has before.
With no memory it won't boot. Do you have a speaker connected to the MB so you can hear the beeps when you turn it on?
Witch power supply you have? GTX 260 requires 500W as minimum.
My System SpecsSystem Spec
01 Sep 2016   #3

Windows 7 Ultimate x64

I have had the MB for about 5 years, been on continually, never powered off.
Of course no did not read any manuals.
It has two 4gb DDR2 sticks.
No speaker connected, it has some kind of beeper onboard, no beeps anymore, it used to beep.
THE PSU is a 650 watt, but see only had one plug. Maybe it drew too much power at boot thru the pciex16 slot and fried the board.

My plan is to remove it and clean it and retry it.
This board always had a weird bootup.
It would start then shut down completely, then in a few seconds it would start and boot the os.
There is some kind of dual bios backup, and I think one was corrupted so it would default to the other.
My System SpecsSystem Spec

02 Sep 2016   #4

Windows 7 HP 64

Don't think the main power for the GPU comes from the PCIe slot. It certainly comes from the 6 pin power connector and the two are parallel on the board. I'll guess that one is good, two is better.
No beeps aren't good.
I'll try fist another graphics card.
My System SpecsSystem Spec
02 Sep 2016   #5


moin guys

run into same issue long time ago
gtx 260 needs both 6 pin to work
without (or only one connected) fans move a bit when powered on and thats it
My System SpecsSystem Spec
02 Sep 2016   #6
Layback Bear

Windows 10 Pro. 64/ version 1709 Windows 7 Pro/64

Your card specs show the need of two (2) 6 pin power connections.

GeForce GTX 260 | Specifications | GeForce

Thermal and Power Specs
Maximum GPU Temperature (in C)
105 C
Maximum Graphics Card Power (W)
182 W
Minimum System Power Requirement (W)
500 W
Supplementary Power Connectors
6-pin x2
If your power supply doesn't offer enough connections I would recommend getting another power supply that does.

It's very unusual that todays modern power supplies don't offer two (2) 6 pin connectors for a video card.

Please post a site showing what power supply you are using.

Please fill in your (My System Specs) completely.
Look at my (My System Specs) and you will get a idea of helpful information that can be included.
My System SpecsSystem Spec
03 Sep 2016   #7

Windows 7 Home Premium 64-BIT

The card ends up not getting enough power so it will fail to boot to avoid any problems with the hardware.
My System SpecsSystem Spec
03 Sep 2016   #8

Windows 7 Ultimate x64

I understand that the GTX260 card prevents a boot if not enough power.
I pulled out the card and put in a low power card, tried two, and it wont boot.

I took out the memory, turns out is DDR3. Memory works fine in another PC.
PSU works fine in another PC. Leaves the MB or CPU as the problem.

PSU is this one, only a single 6 pin pcie connector.

Lead Power GOLD ATX 12CM Fan 650W Silent Power Supply w/20-24pin SATA PCI-E

Actually this has been a very good PSU, it is also very silent on the RF bands. And it is very light weight.
My System SpecsSystem Spec
03 Sep 2016   #9
Layback Bear

Windows 10 Pro. 64/ version 1709 Windows 7 Pro/64

If this is your power supply you have more than one problem. One being the power supply.
A low quality or defective power supply can cause all kinds of problem. Some of those problems can only be checked by replacing hardware with known good hardware.
The first step is installing a quality power supply and working from there.

I would not trust that power supply in a dumpster.
A very light power supply is another indication of lack of quality of a power supply.
It's very light because needed quality components have been left out of the power supply.

Putting that power supply in another computer to test is risking the other computer.

Please note:
Their is no such thing as a cheap quality power supply.

Just my opinion.

My System SpecsSystem Spec
03 Sep 2016   #10

Windows 7 Ultimate x64

I also though of that too.
I suppose the PSU could have spiked the voltages when under startup load of that card and fried it.
OR it was just the MB time to fail.

But that PSU has worked fine on another 6 core AMD MB for years, since 2011 being on continuously.
Specifically this here

AMD FX(tm)-6300 Six-Core Processor
Product Name: 760GM-E51(MS-7596)

That is the system I am currently using now, and a GT610 Nvidia card, and 16gb DDR3.

The P5QC board was having boot issues for years, it would when you power on, spin the fans, then stop and a couple seconds later startup normally. Which I never could figure out. Years ago, I updated the bios, and there seemed to be a backup bios, so I wonder if the bios is wrecked? After I had ubdated the bios, it started doing the weird boot up, this was years ago.

The sequence of events was I had an Asus p5QC with an Nvidia GT610 with 8gb ddr3
I pulled a GTX 260 out of another PC I use for WMC, and went with onboard DVI video.
So then thinking I would like to run the GTX260 in my Asus board, required a PSU with more oomph, so took the Lead Power PSU out of the case having the 6 core AMD fx cpu, and put it into my Asus p5QC case.
My System SpecsSystem Spec

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