system rebooting repeatedly on startup and fans still working after shut down

hi everyone. it's been a while that I have these problems. I've read other threads that were about the same problem.
my fans work after I shut down the system and I should hold the case power button for 5 seconds to turn it off properly. and the other problem is when i start the system it reboots repeatedly and it turns on by chance. I should wait to see what happens.


I read that this is a common problem with asus motherboard and already tested these solutions:
1- clearing the CMOS jumper ....Result---> it worked, the system after one or two shut downs worked well but after a few days the problem came back

and there is one other thing that I think mentioning might be important, our home doesn't have an earth cable, (I mean plugs have 2 holes not 3) and I've heard it can cause static electric on the case that may cause these problems. but I connected my case to the water pipe to act like an earth cable, and it works fine. you don't feel electricity by touching the case body.
2- system properties> startup and recovery>settings> uncheck the automatically restart option ----Result----> it worked again, the system shuts down and all the fans shut down properly but after a while the problem is back :|

3- check the hardware ----Result---> an expert tested my system and he said the problem is with your motherboard, and the asus guarantee changed my motherboard and gave a new one instead. Happy :) testing the system with the new one, and the problem is still with me :|

these are my system information:
windows 8.1 pro 64bit
ASUS p8z77 v-pro
i7 3770 K
AMD Radeon HD 7800 series
RAM 16G Jual channel DDR3
storage western 1T
storage 64G SSD
power supply Green 585 watt


I think my system is cursed with this problem, maybe I should ask a witch for help :D just kidding
so please help, it's driving me nuts. I have many works to do but the problem is always a pain
thanks
8 answers Last reply
More about system rebooting repeatedly startup fans working shut
  1. How old is your PSU? If it was under load for an extended period of time it may be time to replace it as the wattage output dropped.
  2. Insane NiTEmare said:
    How old is your PSU? If it was under load for an extended period of time it may be time to replace it as the wattage output dropped.


    it's new. I bought the whole system about 9 months. and I'm using a power protection supply for my case.
    do you think it's needed to test the power?
  3. If you have a way to test the PSU (be it another rig to test it in and/or another PSU) it would help, I've had an old rig (ie PGA Pentium 4) dusted off for server use that we went through all the parts until we found the PSU to be faulty.
  4. It may be an option but I don't think the problem could be with the PSU, because the expert whom tested the system was sure about health of all the parts except MB.
    any other idea?
  5. Have you touched the RAM settings in the BIOS? Some RAM won't accept much besides their default setup.
  6. try an memtest as well if you can download it. RAM faults can occur with or without any BSOD or warning, whether before, during or after booting.
  7. Insane NiTEmare said:
    try an memtest as well if you can download it. RAM faults can occur with or without any BSOD or warning, whether before, during or after booting.


    hi again. I did as you say. I downloaded the latest version of memtest and tested the RAM and everything was ok.
    any other idea? should i check something else?
    thanks for you help
  8. Have you checked your motherboard has the right fan speeds? If it reports low speeds it may shut down even if the CPU stays at a regulated temperature
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