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  1. Joined : May 2015
    Posts : 1,380
    Win 10 14393.51
       02 Dec 2016 #31

    joeandmarg0 said: View Post
    For bobkn.
    The psu delivers different voltage supplies for various fittings,e.g. one for an optical drive and one for a hdd.Each separate output is called a "rail" and any one can fail without the whole unit stopping .Hope this answers your query.if not let me know.
    Regards,
    Joe
    I have some awareness of that (3.3V, 5V, +12V, etc.).

    Unless I missed something in a post, I didn't see any indication that one of the PSU rails was dead (or out of spec).
      My System SpecsSystem Spec


  2. Joined : Jul 2015
    Posts : 67
    win10 home
       03 Dec 2016 #32

    There is definite indication of a power problem in the original post.Mouse and keyboard work,nothing else.The last psu I replaced had only the case exhaust fan working.When bench tested,that was the only rail working and to be fair,the psu was 12 years old.No one can be dogmatic about computer problems,the introduction of win10 proves that,Either substitution or test will positively prove or eliminate the psu.It is simple to do.
      My System SpecsSystem Spec


  3. Joined : Jun 2015
    UK
    Posts : 1,324
    Windows 10 Home x64 (Laptop), Windows 10 Pro x64 (Desktop)
       03 Dec 2016 #33

    The PSU needs to output the correct voltages under load on all rails and the +5V standby circuit and power on control circuit needs to operate properly. The PSU should generate a +5V standby output to the motherboard at all times when the PC is off and the PSU is turned on at the mains. Pressing the PC power on button causes the motherboard to send a power on signal to the PSU (derived from the +5V standby power line). The PSU should then respond by outputting the correct voltages on all rails and sending a Power Good signal to the motherboard when the voltages have stabilised - this usually takes 0.1-0.5 sec. The motherboard will not power on the PC until it receives the Power Good signal from the PC.

    I've had two XFX PSU's fail by having faulty +5V standby circuits. There was initially a long delay before the PC would respond to the on button when the PSU was turned on and it eventually stopped working altogether.

    See the links on this page for more information http://www.pcguide.com/ref/power/sup/func.htm
      My System SpecsSystem Spec


  4. Joined : Nov 2016
    Posts : 30
    Windows 10
       06 Dec 2016 #34

    Swapped in the new psu with the cables it came with and same results. No fan spin, no beep, seems like it's it getting any power at all. Just worked 11 hours so I'm going to get some rest. I'll try with just the mobo, cpu, and ram in the morning.
      My System SpecsSystem Spec


  5. Joined : Dec 2016
    Montreal
    Posts : 7
    win7,win 8, kali linux
       06 Dec 2016 #35

    I once faced this issue, and resolved after repairing the OS by recovery disk. If you able to boot into bios use that method.
    If you are unable to boot into bios , this issue is may be associated with hardware(most probably motherboard)
      My System SpecsSystem Spec


  6. Joined : Nov 2016
    Posts : 30
    Windows 10
       06 Dec 2016 #36

    cmd said: View Post
    I once faced this issue, and resolved after repairing the OS by recovery disk. If you able to boot into bios use that method.
    If you are unable to boot into bios , this issue is may be associated with hardware(most probably motherboard)
    I can not get into bios. There is no boot happening at all.
      My System SpecsSystem Spec


  7. Joined : Jun 2015
    UK
    Posts : 1,324
    Windows 10 Home x64 (Laptop), Windows 10 Pro x64 (Desktop)
       06 Dec 2016 #37

    Cedsays said: View Post
    Swapped in the new psu with the cables it came with and same results. No fan spin, no beep, seems like it's it getting any power at all. Just worked 11 hours so I'm going to get some rest. I'll try with just the mobo, cpu, and ram in the morning.
    Firstly check you don't have a dud new PSU. Try the paperclip test I mentioned in post 25 and measure the output voltages if you have a meter. The PSU should power on with the correct voltages on all rails. Also check that the PSU produces a +5V standby output when turned on but not powered up. I've had two PSUs fail due to a failed +5V standby circuit - nothing will happen if this circuit doesn't work.

    If this works, you may have a faulty motherboard. Connect just the motherboard (with CPU & RAM) to the PSU and monitor & keyboard to the PC. Check the lead from the PC On button to the motherboard is secure. You should be able to power on the motherboard, enter the BIOS and check settings. If this doesn't work you have a major motherboard fault or perhaps the On button connection isn't working. Some motherboards have a reset button on the motherboard - try that.

    If the PSU +5V standby circuit works, you can turn on the PSU with the paperclip test and you are sure that the PC On button circuit is working then it's likely you have a major motherboard fault. If so, this is bad luck since you probably need a new motherboard, CPU & memory and maybe issues activating Windows 10 depending what type of licence you have. Good luck!
    Last edited by Steve C; 06 Dec 2016 at 03:09.
      My System SpecsSystem Spec


  8. Joined : Nov 2016
    Posts : 30
    Windows 10
       06 Dec 2016 #38

    Tried just the cpu, mobo, and ram. I used the EVGA jumper and the psu is working fine. I did the paper clip test on my previous psu and it would spin for a second then die. Still, mobo is not booting at all.
      My System SpecsSystem Spec


  9. Joined : Jun 2015
    UK
    Posts : 1,324
    Windows 10 Home x64 (Laptop), Windows 10 Pro x64 (Desktop)
       06 Dec 2016 #39

    Cedsays said: View Post
    Tried just the cpu, mobo, and ram. I used the EVGA jumper and the psu is working fine. I did the paper clip test on my previous psu and it would spin for a second then die. Still, mobo is not booting at all.
    How are you turning the PC on - using the PC power on button or a switch on the motherboard? Use an on board motherboard reset switch or use a jumper to short the connection the PC on button makes with the motherboard just to rule out you don't have a faulty on button.
      My System SpecsSystem Spec


  10. Joined : Nov 2016
    Posts : 30
    Windows 10
       06 Dec 2016 #40

    Steve C said: View Post
    How are you turning the PC on - using the PC power on button or a switch on the motherboard? Use an on board motherboard reset switch or use a jumper to short the connection the PC on button makes with the motherboard just to rule out you don't have a faulty on button.
    To just test the mobo, cpu, and ram? Shorting the pins with a screw driver.
      My System SpecsSystem Spec


 
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