I would like more help with my systems instant shutdown issues.

[Jonesie85]

Hello, I have some questions.

my pc is switching off instantly in a way that you can only turn it back on if you switch off the psu wait 3-4 seconds then switch the psu back on. The pc instantly starts up without having to press the power on switch. Sometimes it is weeks between system shutdowns.

NOTE: I have tried testing the hardware by swapping out parts between 2 am3 machines. it may be a combination of components. The ram isnt listed as compatible it was cheaper to buy a new motherboard (asus sabertooth am3+ 990fx). I have run all the software listing in some of my other threads.


MY QUESTIONS:-

- What could cause this outside of specific hardware malfunctions (psu, cpu, ram, motherboard and graphics card)?

- Could static build-up causethis issue?

- How can i find out if my case is grounded properly (case in my sig)?

- My pc case is open on both side at the moment, is that making this worse?

- Can there be a compatibility issue between an am3 phenom 2 1100t 6 core cpu and ram (listed in sig)?

- I should have stated this earlier but i have fitted an aftermarket gpu cooler (accelero twin turbo). This was my first attempt at it. The stock cooler included thermal tape/paste rather than heatsinks. I placed heat sinks in those locations
instead. those two have fallen of. could the graphics card cause this after curtain use or if a curtain level of its resources are called on. I should state that the system shutdowns continued to happen even with a second graphics card, but not with a third.

Note: nothing has been overcloocked.
G-card 1 - XFI HD6970 (with aftermarket cooler).
G-card 2 - Powercolor 4870 (Un-modified).
G-card 3 - XFI? HD 3400 (Non-gaming and unmodified).


During my tests, i plugged my spare PSU (modular) into my main pc plugged in my HD4870 turned on the pc. it loaded up, i opened net browser then i heard a very loud pop. the Graphics card was hot for 30 minutes after i removed it. i am asuming at this point that i used an incorrect modular cable for 1 or both of the psi-e 6pin connections.

I assure you that the shutdowns were happening long before the graphics card pop.

I am fully aware that over the past 4-8 months i have affectively flooded the forum with questions about system shutdowns. I

am sorry. i am a very desperate man. the withdrawal symptoms are getting to me.

Thankyou for your time and patience.

 

[Layback Bear]

The thing that pops into my head first off is in your first post.
The pc instantly starts up without having to press the power on switch.
Here is the way it should work. When you use the switch on the power supply. (off and back on) you should have to use the normal power switch on the tower to boot (turn on) the computer. That indicates to me in the process of your previous problems plugging things in and out the power switch circuit on the tower that goes to the motherboard is your cause. That circuit is also part of the motherboard. So what we have is.
1. The switch it's connector or harness on the tower damaged.
2. The mother board damaged.
3. All of the above.