The motherboard or mainboard is the central printed circuit board (PCB) in many modern computers and holds many of the crucial components of the system.

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Wrong total ram ( 8 GB installed, 4 appears and used in total )

I have this motherboard: GA-X38-DQ6 which can hold up to 8 GB of Ram. When I got this computer it had 4 memory sticks, 1 GB each, and everything was fine. Now, I have two sticks, 4 GB memory each: ...
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40 views

Is my motherboard broken?

I restarted my computer yesterday morning . It started to boot back up, but hung on the motherboards' boot screen. I could not select any options with my keyboard, which was working at the time. The ...
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27 views

Computer won't start/react while new gpu is plugged in

I just upgraded my computer and changed almost everything except for the case and psu (650W). My parts: ASUS ROG MAXIMUS VII HERO Intel Core i7-4790K Kingston SSDNow V300 240GB 2.5" OEM Corsair ...
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42 views

Mint 17 with Gigabyte motherboard: no audio from rear audio port

I just installed Mint 17. I'm having an issue getting audio from the rear audio port. When I plug either my headphones or speakers into the front port on the case, the audio works fine, but when I ...
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84 views

Memory tests fail with 2 memory modules but work with either module individually. HP laptop with AMD Radeon HD 6520G

I'm getting recent memory test failures in an HP Pavilion g7-1303sa laptop (one month out of warranty :( ). The memory is the factory installed 6GB installed as a 2GG module in the top slot and 4GB in ...
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87 views

Sometimes I see black screen after windows logo, especially with cold boots

When I'm cold booting from my computer, this happens: Motherboard Logo > Windows 8 loading logo > Black screen. In the black screen, keyboard "num lock" key does not toggle the num lock LED. ...
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136 views

Troubleshooting processor upgrade, Paxville on Dell Precision 670

I've got a Dell Precision 670 with an XC837 motherboard and BIOS at version A07. I'm trying to upgrade this from using a single-core Celeron to a dual-core Paxville processor. When I install a single ...
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268 views

Asus Z97 Mark 2, i7-4790 getting CPU graphics to work

This is a new build. I've been trying for two days to get the CPU integrated graphics to work. The motherboard has a "displayport" connector which I have connected to my Asus PA246Q monitor, also ...
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108 views

BIOS not reaching post

GT70 0NC-012US Issue: BIOS not reaching post Backstory: Several days ago,my slave HD started to lock up the OS with any related programs running from that disk. In an attempt to fix it, i used ...
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58 views

MemTest86+ bad adresses constant despite swapping sticks, processor/MOBO to blame?

(Sorry for the wall of text, but people seem equally critical of missing details) After about 2 years without trouble, I've been having issues recently with system instability, BSODs, random ...
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403 views

PC won't start unless I reset CMOS

Situation: My PC is dead in the water. Both power buttons (Case/MB) have no effect. If I pull the power cable, reset CMOS, reconnect the power cable, then press either power button the PC fires right ...
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394 views

Why can't my ASRock N68-S3 UCC based machine access the full capacity of 3TB hard drives?

I recently bought a 3TB Western Digital Green internal hard disk, but discovered that I could only access about 768GB of the capacity on my current desktop PC. After some investigation, I've traced ...
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60 views

Computer won't power on

Was working fine for over a year, now won't boot. LEDs on the GFX card and one on the MOBO labeled PWR glow when plugged in, but nothing happens when I push power and shorting switch pins does nothing ...
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1k views

Random BSOD crashes when all RAM slots are occupied

Although I'm a long term user of other StackExchange sites this is my first question on SuperUser, so please let me know if I've neglected any community customs I am experiencing regular BSOD crashes ...
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257 views

How to diagnose issue between mobo, RAID, and SSD cache drive?

Background This issue is happening on my custom-built desktop. Relevant specs: Motherboard: ASUS P8Z68-V PRO Utilizing Intel RST technology (application that uses unused SSD as cache) Processor: ...
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2k views

Stop the constant random reboots of my GIGABYTE GA-B75M-D3V

I've got some issues with a new system. It's rebooting constantly. The system consists of a: brand new: Gigabyte GA-B75M-D3V with F9 BIOS (latest) Intel Core i5-3470 Ivy Bridge 3.2GHz 2x 8GB ...
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130 views

Computer motherboard failure?

So, I am pretty sure this will be a unique problem One of my fellow employees took a cable with a RJ-45 jack on one end, and a USB on the other and thought it would be neat to plug the cable into the ...
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402 views

new pc build— CDROM not booting

I've just finished a new PC build using a Gigabyte GA-970A-UD3 AM3+ motherboard and SATA DVDROM and HDD. I've set up the bios to use the following boot order: CDROM HDD I know that the CDROM drive ...
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18 views

What could cause a GPU upgrade to result in a 50% performance loss?

Background (The Why?) I'm using AMD Graphics Cards for distributed GPU computing. BOINC, Folding-at-Home, and similar. The Problem I've replaced my old card, an R7 260x, with a much more powerful ...
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35 views

Interesting RAM hardware Issue

I am having an odd issue with my desktop computer. I have 8 GB of installed system memory, (MSI 990FXA-GD80 Mobo and AMD FX-6300 CPU) and occasionally, usually after changing settings in BIOS and ...
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53 views

Flashing BIOS using an external SPI programmer

Has anyone succeeded with BIOS flashing using an external SPI programmer ? I saw some cheap serial flash spi programmers on eBay for very cheap price such as $3. (CH341A based programmers) I was ...
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31 views

Dual Monitor Setup

I wanted to have a dual monitor setup, but it won't detect my 2nd monitor. I already went into BIOS and enabled the onboard graphics as well as the surround view. I've tried it before and it worked. ...
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173 views

asus p8z77-v lx and gtx 970 not working in pci-e 16x

Today I got this motherboard cause my old p67 motherboard wouldn't work with msi gaming gtx 970. It showed a black screen and refused to post, like it wasn't even connected with the monitor. This same ...
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20 views

no power after resseting cmos?

My computer wouldn't let my usb keyboard work on boot and i could not access BIOS. So, i did what i usually do and remove the battery from the mobo and put it back again.At first, it would turn on but ...
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22 views

ASUS M2N68 BEEP 1 long, 3 short, Tried everithing, works only with one video card

I have the following configuration: ASUS M2N68 Rev.2 AMD AM2 5400+ 2x1 Gb Kingston DDR800 GeForce 8400GS 256M/64B PCIx SL500-A PSU The PC works like a charm for years until I accidentally pressed ...
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36 views

System BOOT fail

My PC started behaving weird when booting. When I press the power button it sits about 25sec doing nothing, just spinning the fans like crazy. After that it beeps as normal, starts checks and this ...
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22 views

Video card not working only on one computer

I got this weird problem. My girlfriends computer suddenly just stopped displaying any picture oon the screen. Video card is Nvidia GF9400GT, which is originally silent, but I've added one 60mm fan to ...
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90 views

Some CMOS Settings Not Retained on Reboot. Battery good

Some CMOS Settings Not Retained System: Dell Inspiron 546 Motherboard: DELL F896N 0896N Experience: Advanced Issue: Some CMOS settings are not retained after saving and reboot. Some CMOS / BIOS ...
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6 views

USB ports reseting issue

Every once in a while, the USB ports on my motherboard stop working. It only happens with my keyboard and with my WiFi stick. I can easily fix the issue by unplugging the USB adapter and then ...
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80 views

Does the ASUS P7P55D Motherboard support the 4th generation Intel Core i5 processor?

I have a PC I built based on the ASUS P7P55D motherboard. Currently it has an Intel Core i5-750 LGA1156 processor in it, a 3rd generation processor. I just found out that to run the Intel RealSense ...
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138 views

RAM and Motherboard compatibility

Firstly, I apologize for my English. It's really hard for me to write this lines; please, understand if I'm not clear enough or I explained very briefly way. My motherboard is an Intel DX38BT. I ...
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118 views

Graphics card fans very loud, no video/unable to boot

So let's back up a few months. I came back from work one day to find my computer on (I remote desktop to it occasionally) but my graphics card (Gigabyte GTX 770 OC-2GB version) fans running very ...
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147 views

Mainboard beeping for error but running fine - beep codes corrupt?

I traded CPU, PSU and Graphics Card with a friend. When I took his parts and build my PC everything works fine. When We tried to put my parts in his PC, the Mainboard did a non-ending 2 tone siren ...
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88 views

Update BIOS Z87X-OC Q-flash

I'm trying to fix some issues with my PC namely, the erratic CPU performance, power issues and graphics card malfunctions. I've been advised by the manufacturer of my PC to update the BIOS on my ...
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61 views

How to run an application in linux just before poweroff and after linux shutdowned itself

I have a embedded system that needs to be power off itself after shutdown. To power off, the Linux should send a command via an i2c to another device to power off the Linux board. So to shutdown and ...
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99 views

Asus motherboard with 'CPU_LED' on

First, Here are some pictures of what I'm seeing. Here is by build: CPU | AMD FX-8320E 3.2GHz 8-Core Processor CPU Cooler | Silverstone AR03 81.4 CFM Sleeve Bearing CPU Cooler Motherboard | ...
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180 views

SATA 6Gb/s drive only works in legacy mode (SATA 3Gb/s)

I've got ASUS Sabertooth 990FX mobo (rev. 1.0) with AMD SB950 controller for SATAIII drives and JMicron JMB362 for SATAII drives. I've got Intel 330 SSD hooked up to SATAIII (AMD) controller and it ...
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153 views

HP laptop doesn't power up

I am kindly asking for your help. I have an HP DV7T-6C00 laptop which doesn't power up at all. I have read various forum threads and they did not solve my problem that's why I'm opening a new one. It ...
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59 views

How can I re-establish my RAID5 Array (Intel Rapid Storage)?

I had a RAID 5 array, but two of the drives dropped from the array. (While troubleshooting another issue ASUS suggested I update my MoBo BIOS, but neglected to tell me this would corrupt my RAID ...
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120 views

Memory not compatible with motherboard?

I've been getting BSODS on my computer and have tried everything that I can think of to find out what's causing... My motherboards memory compatibility list is: ...
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128 views

How to diagnose dual channel memory / motherboard?

I have ASUS P7P55-M with 12GiB of memory, but it sees only half of it: dims@sagittarius-a:~$ cat /proc/meminfo | grep MemTotal MemTotal: 6102272 kB Simultaneously, it is visible from OS ...
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124 views

My PC blacks out randomly. Screen says “No Signal”, fans and LEDs are running

My PC blacks out randomly. After running for maybe 1hr or so the monitor blacks out and displays "No Signal". Audio also stops and I am unable to turn off the PC with keyboard shortcuts. The green LED ...
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62 views

Optical drive delaying boot substantially

I've built a new PC with the ASUS H81M-PLUS motherboard, but the DVD drive that is connected to it by SATA delays the boot substantially: With drive connected: 30-40 seconds stuck on the black Asus ...
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71 views

Usb ports connecting and disconnecting

I know this is not the place to ask about hardware problems and solutions, but I can't search on google anymore... I've been for over 24hours searching on google about my problem and trying to get a ...
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201 views

MSI 990FXA-GD80 — Won't boot; no POST LED

I've got an MSI 990FXA-GD80 motherboard. As of yesterday, the power button will turn on the fans, but nothing else happens. Even the POST LED's on the bottom of the board don't light up. Any thoughts ...
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31 views

USB 2.0 Port Causing Weird Audio Artifacts on MP3 Player

I have a SanDisk Sansa Clip Zip 8 gb. A little while ago, I built a new computer, and so far everything has been working fine, besides the USB 2.0 ports on the front. The ports seem to work fine ...
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36 views

What's a Sun Ultra 20 motherboard code “44”?

The machine powers on, but the fans don't throttle back, no video, no beep codes. Motherboard LED is indicating "44", which according to my documentation is a "Reserved" code... No burst caps in ...
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761 views

Intel USB3 driver install fails

I've been trying to install the Intel USB 3.0 eXtensible Host Controller Driver (version 3.0.0.16 as supplied by the Asus web site) but it balks when it gets to the PCI bus. At this point the entire ...
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118 views

WHEA-Logger Cache Hierarchy Error in Win8.1

I have a 3 week old machine built by QuietPC http://www.quietpc.com/sys-serenity-pro-gamer Gigabyte Z97X-UD3H with an Intel4790K I'm getting WHEA-Logger warning errors on Win8.1 sometimes every ...
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138 views

eSATA drives keeps disappearing, only reappears after reboot

I have one relatively fat PC at home, that I use as a server, a back-up drive included, and as my gaming PC as well. The Operating System is Windows 7 Ultimate 64 bit. I currently have an ASUS ...