This is where a power supply tester is invaluable. No big deal I thought, maybe I just need to set the MBR or something. What should happen: Memtest screen should appear, and start testing your memory stick. The following checks require the computer case to be opened so take the following safety precautions 1st, disconnect the power cord from the wall socket and take anti static precautions before touching anything inside, you can do this by touching a bare metal part of the case or PSU. So...the most likely suspect is that the mainboard failed. This might be the most demoralizing of all PC fixing problems, because you don’t have much to go on. One other thing! Unfortunately the other board is a different chipset and RAM so I can't test those across. Of the two, rarely does a CPU fail. Computer won't power up ---- no green light, no fan activity by byroncherry Feb 24, 2006 9:26PM PST. Edited by Joe C, 29 July 2018 - 07:38 AM. It looks like a small, silver coin about the size of a nickel. Now when I turn on the PC it won't even get to BIOS, my monitor turns itself off and the CPU fan cuts out after 5 seconds. https://www.asus.com/us/Motherboards/PRIME-B250M-A/HelpDesk_CPU/. . But lately, startup has been completely terrible for my computer. PC build won't power on at all, no lights, no fans. I have only had one in all the years I have been doing this. Also ensure that you are using the right … If you got no beeps with the RAM removed as you suspected either the MB or PSU are bad, PSUs are more prone to failure than MBs and if you are real unlucky the PSU if it fails can take out other hardware with it, check the caps on the MB to see if any are damaged, some info here to help with checking. Continue your benchbuild approach. Then connect the monitor, keyboard and mouse. Powered the system on. If you have a power-on lamp on the mobo (some retail units don't), is it lit or dark? If your computer isn't turning on at all—no fans are running, no lights are blinking, and nothing appears on screen—you probably have a power issue. Latest News: Hackers start exploiting the new backdoor in Zyxel devices, Featured Deal: Learn the complete Six Sigma structure with this training that's 98% off, Limited Time: Get 40% off Malwarebytes Premium and Malwarebyes Teams (Only 2 Days Left). Plug your tablet, laptop, or desktop directly into the wall if it's not already. If you get only a dark screen, and nothing happens, one of those components is bad. Many computers also have a small jumper switch usually located close to the battery. Power cord is fine, f10 will not start BIOS. Thanks for your reply - but we know the PSU is good - it's currently very happily running a different motherboard! Misplaced front panel connectors. It appears the 12 volt section has died, thus no fans. This will reset the BIOS setting to the “new” computer defaults. Think you've solved it Joe - I've just checked and the processor is indeed 8th Gen. There's no on-board speaker so I don't know if anything's beeping. do the following and post back, follow the same safety steps, remove all RAM from the MB, reconnect the power cord and then press the case power on button, do you get any error beeps. Please re-enable javascript to access full functionality. Press the power switch for 5 seconds (clears the capacitors). Hi, thanks for taking the time to respond. Same sypmtoms persist. For further in-depth discussion, you might try this website. Was convinced it was the mobo so we bought a new one. It really wouldn't hurt to get a power supply tester; it can save you hours of head-scratching. A tester with an LED readout will do that. Unplug your computer and … While inside the case, remove and reseat the RAM to make sure it has a good connection. In other words, remove … Most people tend to panic when faced with a computer that won't start, … Disconnect External Devices. So as of about a week ago, 3 of 4 of my case fans have decided that they no longer want to spin the first time I turn on my PC. No sign of overheating, capacitors all look good, am assuming it is motherboard or hard drive? Register a free account to unlock additional features at BleepingComputer.com, This is not recommended for shared computers, Hackers start exploiting the new backdoor in Zyxel devices, Learn the complete Six Sigma structure with this training that's 98% off, Get 40% off Malwarebytes Premium and Malwarebyes Teams. My question: Is there anyway to isolate the problem. After it turns off and on repreatedly for about 30 seconds (4 seconds on- 4 seconds off- 4 seconds on -etc), there are 2 short beeps made by the computer. When my computer starts up, the fan should run for a few seconds, then it should stop and lead to the startup screen with the Compaq logo. Make sure it's not a slow boot. First thing: reset the BIOS (CMOS, actually) back to factory default. Then plug power cable in … The motherboard lights up but neither fan spins and nothing happens. Many computers also have a small jumper switch usually located close to the battery. Please see video below for what happens. So I have this Pc that had an i3 4330 and I sold that one to buy an i5 4460. Bugger!! This is where a power supply tester is invaluable. Most important thing: you have no POST. You can check your computer manual to find where this jumper is located. 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. If your attempting to use a newer 8th gen cpu, it won't work with that board. Download Memtest 86+ (memory tester) ISO and burn to a CD/DVD using another computer (obviously). Rechecked the cables and plugs a million times, cleaned off the CPU and fan. Register a free account to unlock additional features at BleepingComputer.com, When I boot my pc, all fans are running, no post beep, no pc display. I have also received a replacement motherboard from Asus so I'm assuming the board isn't the problem. How can I determine if it's the RAM or the processor? It's as if the lights and fans come on, but nothing is actually loading. Both service and cpu fans spin briefly then stop.. then this repeats on and on. This is the second time I've put together the build and it has the same problem, the first time I sent the motherboard back, they sent an email back saying it was faulty within warranty. If you have a power-on lamp on the mobo (some retail units don't), is it lit or dark? It may sound ridiculous, but … I powered off the system. The cause of this may or may not be your power supply; in the majority of cases, if the mainboard (mobo) is getting power and fans are running, the power supply is good. So, first things first. I'm scared lads, help me out please? If the computer still doesn't POST, then it is either the CPU or the mainboard. I know that the PSU and CPU fan are good - I have installed with another motherboard and all works perfectly. Now try to boot. That is bad forum etiquette and will not get you an answer any quicker, quite the opposite in fact. Gently remove the silver “coin” battery from the motherboard. Tried turning the computer on again, by using screw driver to short the power switch pins. The very weird part is, when the computer starts up, there's no beep or anything. You can check your computer manual to find where this jumper is located. Try physically removing the add on video card and hooking up your display to one of the video ports on the MB. 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