computer building - Mounting motherboard but power led not ligting up
2014-07
Rizwaan
I have bought a motherboard and I mounted it on my case. I connected all the wires that is Power switch, Reset switch, HDD LED but the problem is when connecting power LED and ground. The power LED wire is a single green wire and the ground wire is a single black wire. I tried connecting the power LED but when I power my computer it does not light, I think I should connect the ground wire too but I don't know how to do it.
My motherboard is MSI G31M3-F V2. Can anyone help me to connect the ground wire?
Ignacio Vazquez-Abrams
Both must be connected. Connect the ground to the - pin and the other to the + pin.
Rain
On page 7 of your motherboard manual there is a diagram for the Front Panel Connectors; specifically the group of pins labeled JFP1 (it is where you plugged in the HDD LED & power/reset switches).
The diagram shows a + and a - next to each pin for each of the LEDs/Switches. The single green wire is the positive (+) wire, and the black is ground (-); both must be connected for the LED to function.
Because LEDs are diodes, they only allow current to pass though one way; this is why the wires need to be connected in the "right direction" unlike a switch where polarity does not matter.
Dmitriy Matveev
Something bad happened to my PC several days ago. I wasn't near my PC, so I have no idea about what happened it was just halted. When I tried to boot it was entering infinite loops of a few seconds power up (cpu, hdds, etc) and then power down. I've tried to boot the system with no additional components (that includes hdd, video, network adapters and even memory) connected and that didn't solved the problem, so I've made a decision that most likely it's either some a problem with power unit or with motherboard. I've tried to replace my power unit by another one (which was expected to be working) and the problem didn't resolved again.
I've bought a new MB (ASUS P5KPL-AM SE) and tried to get it running with my old CPU and memory (I hope it's still alive). Since this MB include on-board video I've tried to run the PC without installation of mine video. The PC wasn't running and the BIOS was beeping one long signal following by two short (Does it means a video problem?). After that I've installed my video adapter to PCI-E slot and tried to boot the system again and the BIOS was beeping the same. I don't get it. I may expect some problem with CPU and/or memory since I don't know what happened to my PC (maybe some power failure or something different), but not with video and not with on-board video on newly bought MB. How can I understand what's wrong with my system now?
Dmitriy Matveev
It was a RAM related problem. With empty memory slots or with my old RAM the problem was reproducible as I described it in the question. After I replaced it with different cards it was solved.
Dave M
A POST beep code One long two shorts can be a video issue. Have you tried starting with no expansion cardscards or RAM and see if the beep code changes?
Can you access the BIOS to see what the video configuration is set to now? Use onboard? Use other?