Hi,

This is Shiv from Dell Social Media Support. There are few suggestions that we have to share before trying to swap the video card. Also we need to understand with few things so that we can try and identify if it is a software or a hardware issue.

As for as Software possibilities :-

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* When the computer shuts down does it happens at some particular point ( after 15-30 mints ) from the start of the computer.

* Check if any software / Application update runs in the background when the user uses the computer.

* Try using the computer in safe mode.

As for Hardware Possibilities :-

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* Check if the computer gets over heated ( If so ensure the computer has proper ventilation).

* Check swapping the power cable.

* Try reseating all the hardware peripherals.

* After all these above tried and still the computer has the same problem, then you may try swapping the Video card.

Thank you,

Shiv  G.

Dell Social Media Profession

Hi i got the same problem with my Dell Optiplex 790.

So to answer to the questions above:

1. my computer dosen't shut down a particular timpe...it is a random shut down, it may take 10 minutes or 1 hour

2. No aplication update runs in the background

3. Safe mode didn't try it iet.

4. The computer dosen't get heated up i removed the cover and cleaned it up.

5.Don't know what do you mean for reseating hardware peripherals.

Ok now let me tell you what i did till now : i instaled a new hdd with a new windows(i thought i may have a virus or something) but didn't solved anything.

I'ved entered the bios to see if i have any errors in there but it was clean

Now i'm trying to do a diagnose with the dell client on dell.com/suport buth i can't finish it because shut down.

If you have any suggestions to fix this i will be extremely grateful. Ty

Did you check the CPU temperatures, for instance ? 

Yes and it's ok ... the problem is that it dosen't hard shutdown(i mean suddenly) it shuts down like i wold pres the power once or like i wold press the shut down button on the keyboard ( with the log off screen, shuting down screen)

i'ved just noticed that after shut down some times it stays like this for a while and then restarts :( without pressing any button and some times it shut downs for good :(

The problem was with the power button.