Different boards may have different pin layouts so make to check your user manual.
Check to make sure that your front panel connector cables are connected properly to the pins on your front panel header on your motherboard. If your CPU has integrated graphics, try booting without the video card installed on the board and using your motherboard video ports instead of the card to see if this makes a difference. Confirm that your video card is seated properly and the 6 pin or 6+2 pin PCIe power connectors are plugged in properly from your power supply if the video card requires them. Try each stick in different slots to narrow down whether it might be an individual stick or a slot on the motherboard. Try booting with a single stick of RAM at a time to see if this makes a difference. If you are using more than one stick, verify that they are installed in the correct slots according to your motherboard user manual. Verify that your RAM is seated properly. The CPU power is located on the top-left corner of the motherboard, the motherboard power is located on the right side. Check to be sure both your 24-pin motherboard power cable and your 4+4 pin CPU power cable are plugged in. Test your monitor with another device or test another monitor with the computer to eliminate your monitor as the source of the problem. Make sure you're using only one video cable for your monitor. Verify the monitor is set to the proper input based on your connection type: HDMI, VGA, etc. The dedicated video card ports are normally located below the audio ports, towards the bottom of an upright case. If you have a video card, check to be sure your monitor is plugged directly into it and not into the motherboard video ports. 
It should be set to the line, not the circle.
Check to be sure your power supply switch is turned to the proper setting in the ON position. If you run into problems along the way, manufacturer documentation is a great source of information that is specific to that product. 
Always begin with having read and understood all of the manufacturer guides before attempting to build your computer. Whether you're a first-time builder or experienced, it's not uncommon to run into some snags or miss something minor in your build. 
#New psu now cpu led red Pc#
In this guide we'll go over the general troubleshooting steps to go through if you have a newly built PC that won't power on/boot/POST.
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