pc logging off and shutting down

yirteasoot

hi all ,im having problems with my pc,for no reason it just logs out then start to shutdown,it's not the PSU (just got a new 1 fitted)is it a virus?thanks for any help in advance.:beer:

RussJK

Did the problem start before or after the new PSU was fitted? Does it happen randomly, or is there some kind of pattern? i.e. does it happen at a certain time of day, or a after a certain period of time? Does it happen for all user profiles (you can make a new one to test this)?

It won't hurt to give some details about your Windows version, and what hardware you are running, make/model, etc.

It's possible that it's a virus, but usually not.

Feel free to post a Hijackthis log (http://www.trendmicro.com/ftp/products/hijackthis/beta/HijackThis.exe, SCAN and SAVE LOG, post the log that comes up in Notepad, don't FIX anything yet) and we can see what's running. Similarly it won't hurt to run Malwarebytes QUICK scan (http://www.malwarebytes.org/mbam-download.php), clean anything it finds and feel free to post the log.

santer_2

You could run full scans in safe mode

If it restarts randomly it could be the video card software

If it shuts down and stays off for a while it could be temperature, they did connect the fans when they changed the PSU?

RussJK

Further to what Santer said, you could use System Information Wizard (http://www.pendriveapps.com/portable-system-information-diagnostics-tool-for-windows/) or a similar program to see what the temperature is.

yirteasoot

sorry russ,it's wndows 7, problem started before new PSU was changed

pc can run for anything from mins then shutdown or 5hrs.

shuts down anytime day or night,no obvious pattern,

fans are in good working order,

i use norton av.


ps thanks all.:T

RussJK

What kind of applications are being run when it shuts down, e.g. light activities, or gaming? What video card?

If you post the following:
- Hijackthis log (as above)
- Malwarebytes QUICK scan log (as above)
- SIW temperatures (hard drive, CPU, graphics card)
- SINO log: http://www.artellos.com/ccount/click.php?id=9
and please tick the items like this:


then it might be easier to pin down the cause.

Also you can feel if the case seems hot, and you might make sure you have the latest drivers for the graphics card.

You might also manually check the Task Scheduler to make sure there's nothing weird in there, also in the Tasks folder (c:\windows\Tasks). It's possible for example to make a Task with a triggered by User Log on, set with a random delay over hours to shut down the computer.

santer_2

Another option after running the above

[FONT=Segoe UI, Arial]If your computer unexpectedly reset or shut down, it is suggested that you run WhoCrashed. WhoCrashed will tell you if crash dumps are enabled on your computer, if not it offer you suggestions on how to enable them.

Click here for more information about sudden resets and shut downs. [/FONT]

http://www.resplendence.com/whocrashed

yirteasoot

all,thanks for all your help,i will take all your info with me to a shop in Dundee,(not sure if i can name them)but they do have a good reputation,i would try what you tell me myself but im a awful with this kind of stuff:sad:once again:beer:

RussJK

It's fine if you aren't great with computers, if you follow the steps we may be able to help you (for free).

Just try the steps given one by one, and post with specific questions if you have trouble completing a particular part.