Computer shutting down

Hi

My girl Friends Computer keeps shutting down. It started when I replaced the monitor, now it shuts down one time each night.
When the AC is on or it is a litter colder it does not do it.

I have tried to put the old monitor back on the computer but the monitor does not turn on not even when doing the cmos memory check. But I can hear the computer starting.

but the new monitor works fine apart from it saying that the display needs to be 1440*1600 or something and the computer shutting down. We have the setting it set a little higher because the computer does not have this setting . I think we have at set at ????*1600 I am not sure of the first number.


Has anyone get any ideas

 

Sure sounds like the computer is overheating. Open the computer, clean out the dust and cobwebs (a vacuum cleaner works fine). Then check to make sure that all the fans are working and nothing is obstructing the air flow.

 

Last weekend I checked the fans and all where working fine,

Is there a program I can use to check the temp when the computer is running? last weekend I had to keep going into cmos to check the temp.

 

Try SpeedFan: http://www.almico.com/speedfan.php
or PCWizard: http://www.cpuid.com/pcwizard.php

Be forewarned that programs claiming to measure computer temperature may not work reliably. If you read the documentation, they will usually explain this.