system rebooting repeatedly on startup and fans still workin

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 just kidding
so please help, it's driving me nuts. I have many works to do but the problem is always a pain
thanks