GA-MA785GM-US2H won't post

[jimwvisi]

System: GA-MA785GM-US2H board, Athlon II X4 620, 2 sticks 2Gig Kingston DDR2 RAM in slots 1 and 2, 1 500gig Samsung SATA drive, 1 Philips DVD-RW - Antec Earthwatts EA-430D 430 watt power supply.

First tried plugging in JUST 24 pin ATX connector. Turn on, CPU fan spins, devices power up, no post at all - no beeps, no monitor activation.

Then plug 4 pin 12V connector into the half of the 8 pin 12V connector that it fits. Result - nothing - no fans, no devices powered up, just nothing.

Remove 12V connector - fans spin, devices power up, etc.

Replace 4 pin 12V connector - nothing again.

Does this mean anything to anyone? Is the PSU too weak to power the CPU? I'm going to try another PSU / CPU tonight, but I thought I would see if this particular behavior meant anything to anyone.

Thanks!

[artdrivers]

Re: GA-MA785GM-US2H won't post

Have you tried to clear cmos?
Try turning the power switch off at the power supply and press and hold in the front case power supply for 20 seconds. Then clear cmos.
Page 33 of your manual.
Manual----> http://download.gigabyte.ru/manual/m...-ud(s)2h_e.pdf
Added instructions is to remove cpu and memory before clearing cmos if first clear cmos attempt fails. Check pins. Check for insertion. Try this before a out of case bench test for P.O.S.T. is performed. It may save you some steps.

You may need to first post with a different cpu.
When I looked up the cpu list. If you scroll down to the Athlon II X4 620 it shows the motherboard needs to be flashed to the F4 bios for that cpu. This may have not been performed before you received the motherboard. I don't know.

http://www.gigabyte.us/Support/Motherboard/CPUSupport_Model.aspx?ProductID=3143

[jimwvisi]

Re: GA-MA785GM-US2H won't post

Thanks very much for the help. Unfortunately I think it is DOA. I put in an Athlon 64 5200 CPU and a 500 watt power supply from a working system, and even after clearing CMOS I get the same behavior - as soon as I put the 12V 2x2 connector on, nothing at all happens. Strange. I guess I'll RMA it.

I thought sure the older CPU and flashing the bios would do it! Thanks again.

Jim

[AlhambraSteve]

Re: GA-MA785GM-US2H won't post

I have a GA-MA785GMT-UD2H with a similar issue. Brand new board. New CPU, new power supply, new memory, new hard drives. All of which seems irrelevant. I can't get the system to start. I suspect it is related to the MB power connectors. The board has an 8 pin power socket and a 24 pin socket. The power supply has a 24 pin plug that I've connected to 24 pin socket. There is no 8 pin plug on the power supply. The PS has a 6 pin plug and a 4 pin plug. I've tried both in the 8 pin socket and still the system won't start. The power supply fan does not turn on, but there appears to be some power as the LED in my usb wireless mouse transmit/receiver unit turns on.

Do I need a different PS or can I get an adapter that will convert the 6 pin plug to an 8 pin?

[Lsdmeasap]

Re: GA-MA785GM-US2H won't post

You can use a 4Pin CPU ATX 12V plug in the 8pin CPU ATX 12V plug, but you must plug it in properly. Meaning into the part that was not covered by the black cover to begin with.

8pin ATX 12V EPS power plug is recommended on boards that have this connection, adapters are not suggested

For those who have only 4pin plugs, sometimes these PSU's are just not even good enough to start the system.

I advise a PSU that has 8pin 12v ATX EPS Connections, otherwise you are just going to have issues

[artdrivers]

Re: GA-MA785GM-US2H won't post

You will want to perform a out of case bench P.O.S.T. test on that motherboard before sending it for an RMA.
Please follow the following simple steps.
You must remove the motherboard from the chassie tray and case.
1. Place the motherboard on top of the cardboard box (you can use the motherboard box)
2. Clear Cmos with the short clear cmos jumper or removing the battery for the period of time suggested by your manual.
3. Install the CPU, CPU fan, Memory, Power supply plugs (plug the 1 X 20 pin and 1 X 4 or 2 X 8 pin from the power supply unit) and a video card.
4. Hook the monitor to the video card and be sure the monitor is switched on.
5. Turn on the system board by using the case "Power on" switch.
If the system fails to POST, check the components' insertion again to ensure they are all connected properly.
If this fails RMA. This may save you some time and S&H charges if it is a short from the case.


The 6pin plug is for a graphics card. You need to use the 24 pin and the 4 pin plug. The 4 pin plug should only connect one way in the 8pin socket. If you have a 20 pin plug from the power supply you it could have two 4 pin plugs. One to go with the 20 pin plug to equal 24pins and one for the cpu 12v 8 pin socket. They still should only go all the way in one way.

[jimwvisi]

Re: GA-MA785GM-US2H won't post

Thanks again for the info. I am going to run by the local Best Buy today and pick up a new power supply with the 8 pin plug. I saw a post in the Newegg customer reviews for the board that stated the guy couldn't get it to work until he bought a new power supply with the 8 pin plug, so I'm going to give it a try before I RMA it. I will also do the out of case test if it comes to it, but I bet the new PS will solve it. I'll follow up when I have the results. Thanks!

[Lsdmeasap]

Re: GA-MA785GM-US2H won't post

Ya I have seen a few not work until you use the full 8pins

[artdrivers]

Re: GA-MA785GM-US2H won't post

I agree Another power supply may be the answer. The cpu is rated at 95watts which is why it's a a good idea to go to 8 pin. Two 4pin sockets and wires are better than one. I hope the power supply will be higher rated than 430 or 450watts as well.

[jimwvisi]

Re: GA-MA785GM-US2H won't post

Well, a new Antec 650 watt PS didn't do the trick, so I pulled the board out and did an out of case post test, and voila! I also noticed with the new PS that when I turned it on with the 12v plugged in (in the case) the supply clicked audibly. So I guess there was a short. .Thank you Mr. Artdrivers for saving me a restocking fee! Now, what should I look for as to the short? Not sure where it could be shorting to cause this kind of behavior. Thanks again!

[artdrivers]

Re: GA-MA785GM-US2H won't post

We are glad you are on the right track. To start check to be sure the board does not bottom on the chassie. Check your standups for the proper height.( Not to tall and not to short.) Also check the IO back plate. It has grounding prongs that can get out of position and short to a USB socket or on the board ect. Inspect them closely. I have to get out a bright light for this task. I wish the best for your install.

[AlhambraSteve]

Re: GA-MA785GM-US2H won't post

Lsdmeasap:
Thanks for the advice. You can't go wrong in positioning the 4-pin power plug even if there is no cover on the other 4 holes (as is the case on my MB). The plug only fits into one position. It won't insert into any of the other possible positions.

The next day, I re-examined all of my cable connections and found that 24 pin ATX power connector was not fully engaged. I fixed that and the board booted up.

[jimwvisi]

Re: GA-MA785GM-US2H won't post

I found that I had a post in the wrong position - directly underneath the 12V socket! So the board is back in and running like a champ. I'm glad I got a new PS anyway, I should have included that in the original build. Thanks to all for the help - what a great forum!