PC Turns on/off repeatedly at start-up

[TheBlackNerdyGamer]

OK. So, after installing a new GPU, my PC started turning off for about 3 seconds at start-up, then it cycled on again by itself and the system ran normally after that. (This went on at every start-up.) I then read online to learn about a solution and I came across some instructions to reset the CMOS with the jumper and/or battery on the motherboard. I tried this and after I jumped and cleared the CMOS for about 10-15 seconds and took out the battery for about 5 minutes, (of course repositioning everything afterwards). My PC turned on for a split second, turned off for about 3 seconds, turned on for about 3 seconds, turned off for about 3 seconds, then turned on and the BIOS was reset. I then reassigned the BIOS and my PC worked fine! BUT!!!!...When I shut my PC down and came back to turn it on again, my PC turned on for 1 second, off for 3 seconds repeatedly until I unplugged my system and jumped the CMOS and reset the BIOS, then it works until I shut the PC down like I explained before. Please help!!!

PS. I tried removing the GPU and I also alternated my two RAM sticks and it still does the same thing. The PC works perfectly once it's up and running. Game graphics are maxed and everything. My PC can also restart from the task bar without any issue. It seems that something is stopping it from powering up after shut down.

Specs:

CPU: Intel Core i7-3770K 3.5GHz Quad-Core Processor

Motherboard: Asus P8B75-M LX Plus

8 Gb Ram

Storage: 1.5 TB 7200RPM Internal Hard Drive

Video Card: EVGA GeForce GTX 780 3GB

Case: NZXT Source 210 (Black) ATX Mid Tower Case

Power Supply: Thermaltake TR2 700W

Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit)

 

[geofelt]

It is likely that your bios does not like a ram setting and takes time to find a ram spec setting that will work for you.
Look at what settings you actually have. CPU-Z will tell you.
Then in the bios set the specs to the same. Or, use a XMP setting.
Test your ram with memtest86+.

 

[Qan]

How could i go to the bios if my desktop getting on and off itself repeatly every 1 second? Phewww tough job for noob

 

[geofelt]

After booting, CPU-Z will tell you what your ram settings are set to.

You should be able to enter the bios between the time the cycling goes on and when windows boots.
Just keep tapping del or F2 . If your ram settings look wrong, that is the time to correct them.

Another possibility is that your motherboard needs a bios update for proper operation.
DO NOT update your bios unless you see that an update fixes your problem.
A failed bios update can permanently brick your motherboard.

If you do update the bios, do not use windows, use a USB stick to do the job.