Question My PC boot-loops repeatedly ?

[cazetoG]

Hi all.

So I'm in a bit of a trouble here.

My PC won't boot up - it's stuck between powering on and then off (all within a second) - and it keeps doing this until I turn off the PSU on the back.
Sometimes I can get my PC to power on and use it like I normally would, play games, watch movies etc - and no problems at all - but when I shutdown the PC and try again later to boot it - the problem re- occurs.

When the problem was occuring, I tried removing some of my USB hardware connected to the PC - and it would then power on, and I could replug the USB hardware and continue using the PC. So if I had too many USB connected it would'nt power on and go into that cycle I mentioned.

Note: I have 4 USB connected to the PC, keyboard, mouse, steelseries hub for headset, mousepad.

I originally thought it was the power demand that caused this problem, so I went out and got a seperate USB hub with an individual power supply - and it did help for a couple of days but now the problem has returned.

I've tried taking the pc apart, removing the GPU, removing the RAM - I also changed that little motherboard battery - nothing helps.

I suspect the PSU to be somewhat failing, but I really don't know.

Any help is much appreciated!

Thanks

 

[Aeacus]

Full system specs, including PSU make and model (or part number) is? Also, how old the PSU is, and was the PSU bought new or used/refurbished?