Was convinced it was the mobo so we bought a new one. Tutorial: No POST (Power On Self Test) Thread starter kimsland; Start date Sep 29, ... Unplug the case fan ... is usually the biggest factor on computers that will not start Even bad RAM will result in display problem. It wouldn't wake up from sleep the other day - just a black screen. The lights would come on, the fans would spin (case fan, cpu fan, power supply fan, video card fan). The power comes on, I get lights and fans but that's it. There is no beep however, and no … When the power supply to your computer fails, then it won’t start or power up, but the fans spin regardless. Are you getting post beeps on startup ? Still does the same thing. No POST beeps or BIOS on screen. PC won't start, no POST, no fans, nothing :( Thread starter DunstanL; Start date Aug 12, 2009; ... i then connected my new psu up and powered up with no drives connected to the mobo and the computer went through post etc fine. Fans spin (heatsink, chassis) and power LED comes on, but no video. Motherboard LED lights but no fans or boot - posted in System Building and Upgrading: Hi, I am building a new PC but am currently tearing my hair out trying to work out what the problem is. ... You need to run it for at least 8 passes unless errors start straight away. Everything worked fine until system required new heatsink/fan, and motherboard had to be removed from case. 16 GB. I build a PC for a friend but it will not boot, POST, or give me beep codes. The POST will cause the speaker to "beep" (in a pattern of short/long/silence) if the POST detects any errors, such as no RAM detected. I've had my PC for a year. Spec list: ASUS M5A97 R2.0 Motherboard AMD FX8350 16 Gigs of Crucial brand DDR3 RAM (2 DIMMS) Seagate 550W power supply No POST beeps but all fans and drives run. If you have no idea about RAM, then click on the below hyperlinks "Images". If POST does start, there might be a bunch of "beeps". Just because your fans are running and your motherboard light comes on doesn't mean you have enough power in the power supply to run the machine .Power supplies can die slowly and still appear ok .If you have access to another power supply try changing it out . Idea was to reset BIOS. So I tried holding the power button. If not you may be dealing with a power issue . I'm a bit stumped as to where to go from here. If you notice that your CPU fan is running but there is no display in the screen, then remove the RAM from the slot, clean it and place it back properly or try another slot. Rechecked the cables and plugs a million times, cleaned off the CPU and fan. Build: ASUS Z270-AR 1151 ATX Corsair 64 GB 16x4 D4 2666 Corsair Crystal 260X RGB ATX Zotac GTX1080Ti FE 11GB Tower lights up, RGB fans light up, fans spin, video card lights up, no memory LED on the motherboard, power LED lights up and RGB keyboard lights up. So, no "beeps" implies a problem with the motherboard. 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