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United Kingdom10823 Posts
As the title suggest, my motherboard is not POSTing after I tried to install some new sticks of memory. Pressing the power button turns on all fans except the CPU fan, and the phase LEDs are green, green, yellow, red. Monitor screen is totally black. Also, the PC doesn't seem to automatically turn off after a while, despite the lack of cooling from the CPU fan
Things I've tried:
- Unplugging all components except the mobo, RAM and GPU
- Tried the old memory sticks and new memory sticks in each slot
Should note that this PC has been working fine for the best part of 3 years. My concern is that I've accidentally shorted the mobo when installing the new RAM, but I'd like to get all bases covered before I commit to buying a new one.
My setup:
- Corsair TX 650W ATX SLi PSU
- Gigabyte GA-P55-UD3 iP55 Socket 1156 8 channel audio ATX
- Intel Core i5 750 2.66GHz (Lynnfield) (Socket LGA1156)
- Corsair 4GB (2x2GB) DDR3 1333MHz XMS3 Memory (old set)
- Kingston HyperX Blu 8GB (2x4GB) DDR3 PC3-10666C9 1333MHz (new set)
- Asus HD 5750 1GB GDDR5
If there's anything else that I need to provide, I'm sitting in front of my laptop all day
Thanks in advance guys
EDIT: Ok, I've somehow mad eit onto a boot loop after plugging the primary HD back in. It now turns on for 10 secs, attempts to boot (still not POST sounds) then turns off, and tries again after 2-3 secs. Same phase LED setup, still no CPU fan turning on,
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Try deleting CMOS (look into the motherboard manual). Generally, you switch the PC off at the PSU, and then pull the battery for half a minute or use the CMOS clear jumper. With my Gigabyte mobo (different model than yours), there's two pins sticking out without a jumper, and I have to short those by holding a screw driver to those two pins.
You can force Gigabyte's backup BIOS chip to take over from the first chip like this:
1. Turn the PC on.
2. Turn it off with the normal power button, and not through the PSU. You may have to hold the power button for 4 seconds for it to turn off.
3. Press the power button and hold it down. The second BIOS should boot after a few seconds, presenting a short menu asking you how to proceed.
I definitely had problems with my motherboard working, then changing something about the hardware, and it not working anymore. Clearing CMOS did not help. Flashing the backup BIOS onto the main BIOS was the only remedy. It made no sense.
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United Kingdom10823 Posts
Flashing the backup BIOS worked perfectly, thank you!
This isn't going to be a consistent problem is it? would be nice to know in case I should just scrap the mobo and go for an upgrade now as opposed to later
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It could have been caused by the specific BIOS version you used previously. It probably had a bug that only showed up when trying your new memory. On that note, you should now perhaps update to the latest stable BIOS you can find on Gigabyte's site. The second BIOS that copied itself onto the first BIOS is some ancient version, I'd guess.
I don't think there's anything wrong with the motherboard itself. I have a completely different model and had a similar problem. The programmers at Gigabyte just need a good slap, that's all. I bet that's the only reason the engineers at Gigabyte felt they had to put a second BIOS chip onto their motherboards. 
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I myself just put some new RAM on my UD3R (older P55 board) and had a POSTing issue myself cuz I simply didn't insert it hard enough
It happens to the best of us, but no, I don't see this as a consistent issue.
I did prep the timings/voltage/RAM divider before hand (cuz I was switching from 1.65v DDR3 to 1.35v Sammys).
I'm going to guess you didn't pre-adjust your settings beforehand?
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EPT
