Auto restart even when in idle or in BIOS

I think the MB is somewhat faulty. No beep sound means that.

Check RAM : http://www.memtest.org/

My prime suspects are MB and PSU. Yes overheating is not a problem. Try to borrow a PSU and a GPU from someone else and test it. Or, first test in safe-mode with all your components, see it stays stable or not. If not then remove the GPU and test it again in safe-mode(if you have on-board video).

Else disassemble everything except CPU/Heat sink fan, then install one component each time and test. BTW CM GX 500W is not a good PSU.

Before trying to replace any components, do a clean install of OS. See how the PC performs. Check the HDD with vendors diagnostics tool for health and performance. HDD could be faulty, if so replace it. If the problem persists then RMA the PSU first. And the last resort will be the MB, as you said earlier sometimes it beeps and sometimes it not, so I think the MB is dying.

"Windows Resource protection ..." The good news is that there is a high chance this is completely harmless and nothing to worry about. Updates had a small bug in it which is causing SFC to incorrectly detect the file as corrupt. The file isn't actually corrupt, though. It is just SFC giving a false positive.

About the MB : it should beep under any circumstances cold boot/warm boot/restarting itself/or manually. Take a chance by updating the BIOS. Or RMA it.

About the HDD : Did you check it with vendors tool ? chkdsk will not help in this case. Check disk will not tell you about the SMART values and so on.

You are welcome. Glad to hear at last the problem is solved. Cheers.

I had the exact same problem, I tried for 5 days to fix this problem, but my motherboard and CPU where only two month old, I checked the ram, one at a time, and the gfx card in another comp, even applied new thermal grease to the CPU and gfx card, I mean I really stripped down the CPU and heat sink and the gfx card right down to the bare boards and washed the heat sinks on both, making sure no water residue was left, I even tried applying one ram stick at a time, by now this was pissing me off, I even washed the CPU cooler to make sure there was no dust at ALL, I managed to re-flash my BIOS, even though it would reset in the BIOS, but managed to get a flash successful, I was so frustrated, after all I am 56 and been building pc's for 30 years, I stripped down the PC again and again.

Then just when I had given up and used my tablet for four days instead of my PC, and asked my beautiful partner to purchase a power supply for me as well as other part, I was willing to buy the most expensive UPS, I decided to search the net again for problem solving, I knew I had purchased all the best parts for my PC when I built it just a couple of months ago, and just hours before spending a shit load of cash to have my PC working again, I read on the net that a load of guys where having this same problem, then some one suggested that I eject the cmos battery and clean it and replace it immediately, I though you got to be bloody kidding, remember I have been building PC's for a very long time, never in the past have I ever had to clean the battery on a motherboard that was only two month old. MB and CPU where purchased at the same time, the bastards that sold me the mother board, had used it in the shop, god knows how long, anyway, I ejected the battery wiped it with my dirty T-shirt, replaced it, and hallelujah, it revived my PC, it is now running better than ever for the last couple of days, my PC is as follows:

CPU 4790k, still cant overclock the bloody thing.
gfx card amd HD6950, yea I know old but plays everything, overclocked.
Mem G-skill Sniper 16 gig
HDD 10TB, yes that's a lot as I am a designer
CPU cooler Thermaltake frio, excellent cooler
Power supply thermaltake toughpower 775w
motherboard MSI gaming 7 Z97
case Antec dark knight DF-85, seven fans for god sake, plus extra fans to keep gfx card cool.

I am so happy, my comp is ok, but hell I have spent hours and hours, no wait, it was days and days, of frustration, and to think all it was, just a bloody battery that needed cleaning with a bleeding dirty T-Shirt hahahahahahah

Now I am a happy chappy once again, just goes to show, never over look the simplest of things.