+ 1 Votes Check the CPU fan bart777 6 years ago If the CPU fan has come loose or is not seatd correctly the PC will detect the cooling problem and shut itself down to protect the processor. Open the machine up and verify that the fan is seated correctly, plugged in and starts when the PC is powered up. That's where I would start before you start replacing parts. + 1 Votes Weak CMOS Battery TheChas 2 years ago One thing I did not see mentioned in the thread was to check / replace the CMOS battery and rest the CMOS. I have seen weak CMOS batteries cause bad data in the CMOS memory. As the CMOS battery is only used when AC power is off and not when you just turn off the computer, many people are not aware that their CMOS battery is weak until the system malfunctions after a power outage or even moving the computer. Chas + 0 Votes Power outage, now my cpu turns on and then off after 2 seconds max! simplyfet 2 years ago just experiencing the same problem. I kept on browsing to forums but still no answer with my problem. I'm sure that PSU isn't the problem because I already replaced it with new one. is there anyone who could help solve this? it will be very much appreciated + 0 Votes One other possibility and a couple of hot tips... SmartAceW0LF 2 years ago I have experienced many situations similar to your description which were caused by a PCI Modem or Network card. Before proceeding any further be sure to remove either of these if they are in your system and then try to boot again. In the event of a storm or power outtage, it has been my personal experience that "Surge Protectors" provide only one real advantageous utility. That being a centralized place to plug everything into such that it is only necessary to unplug one wire to effectively isolate your system from the household electricity. Fact: rarely (if ever) does an electrical "surge" ruin your electronics. More often than not, it will be the resultant "Brown-out" or LACK of electricity which kills electrical appliances and electronics. NOTE: There is one exception to the above. YOUR SURGE PROTECTOR WAS NOT DESIGNED FOR -NOR WILL IT- PROTECT YOUR APPLIANCES FROM LIGHTNING. The only thing that will serve as protection from lightning -short of spending a LOT of money- is to unplug the appliances. Further, even following the above advice, it is important to remember that effectively isolating said appliances is not fully achieved without also removing any LAN cables and/or Phone lines as well. This is often overlooked. Repeated interruption of electricity is likewise hard on electronics. Again, more from the resultant starving of electricity than anything else. Your best protection for this is a UPS. But even a UPS will not protect you from lightning. Given that I knew nothing other than what you describe here I would 1.) Check the CPU fan to be assured it is spinning (and continues to do so) on powering the machine. If yes go to number 2, if not replace it and try again. 2.) Remove any internal modems or network cards that are not built into the motherboard and try again. If it still fails to work... 3.) Check PSU. Note: yes there are inexpensive devices that you can plug the PSU into to test it, but it is not unusual for these to register a PSU as good even when it is not. It might not be cost prohibitive to simply replace the PSU and try again if your system is not of a high end nature. + 1 Votes Re: Power outage.. Peconet Tietokoneet 2 years ago You had said this was your first build. Now, when you built this rig are the parts second hand or brand new? If brand new then you have the warranty to back you up by returning the motherboard. If second hand then you will need to look at the motherboard and see if there are any bulging capacitors like here: http://www.thenakedpc.com/dan/Bulging_Capacitors/index.html if you have capacitors that are bulging then you will need a new motherboard or if you are good at soldering you could replace them for a few pence/cents. + 0 Votes Wow Creeping Critter 2 years ago I had the exact same problem with my system. I couldnt find the answer until my friend found out that my cpu fan wasnt working at all or would start spinning and then stop thereby my system would shut off after a few seconds. I guess i could have used this info 6 months ago. + 1 Votes Try this first... rfolden Updated - 2 years ago Unplug the power cord going into the PC at the PC end. Now, unplug that same cord at the Surge Protector end. Wait 5 min. Plug the power cord back into the back of the PC and then directly into the wall. Does the PC then work fine? GREAT! NO? Power Supply in PC toastado. IF the PC worked when plugged directly into the wall then Turn PC off. Plug power cord (MALE end) back into surge protector/power stip. All good? great! Not good? Surge protector has been smoked. Otherwise, THEN crack open the case and start troubleshooting MB connections, etc. Always check the obvious first, unless you know 100% what the problem is. + 0 Votes naultr6 pisono 2 years ago Ive had this problem before. I removed the M/B battery for a few minutes then replaced it and found my system booting properly. Try booting with the M/B boot disk. Let us all know how you resolved the issue. + 2 Votes Video Card Failure? Brian Grimm 2 years ago I have an Acer computer with similar problems. After some searching, I found out that the video card had failed. I'm not sure if it was drawing too much current, or sending a signal to the MB, but replacing the card solved the problem. Good luck! + 2 Votes Stuck Power Switch? willcomp 2 years ago Check that power switch button is free and not sticking. Better yet, remove power switch leads and use a jumper or small screwdriver to short power switch pins on front panel connector. If you have a reset switch on case, use its lead in place of power switch lead. Reset switches are momentary contact switches identical to power switches. + 1 Votes Remove everything except for RAM and video card. dave 2 years ago Any better luck with just the bare minimum?