What I mean is that any programme I use to convert between different video formats cause the laptop to crash with no blue screen (laptop switches off ie.screen goes blank and all drive lights etc.. turn off). I dont have this problem with other types of applications I use (word processing,audio & dvd player etc). I have tried reducing hardware acceleration in control panel>display>settings>advanced>troubleshoot but this doesn't cure the problem.
It sounds like you have hiberation enabled on your laptop.
Right click on an empty area of the desktop and select properties, Select the tab Screen Saver, Select Monitor power, select the tab Hibernate there will be a tick box here to show if hibernate is enabled.
If hibernate is enabled then when you use a convertion program you will need to un-tick this box. Hibernate is used to conserve battery power if there has been no user input for the specified time (keyboard or mouse).
Laptop is resting on a table and hibernation, standbye etc. all disabled. I am wondering if the CPU and/or the graphics card aren't up to the job. It only crashes with video format conversion software.
I'm dont think that the graphics card is involved in video conversions I think it's only the cpu. I could be wrong tho.
Is it possible to find out the temperature of the cpu ie. a temp monitoring program I know running both programs together will slow down your conversions but you will at least you will know if it's the cpu temp. Saying that your laptop may not have cpu temp monitoring capabilities.
Also would you mind if I asked you to tap a key now and again to see if that stops it shutting down, I know this is long shot as it's looking more like the cpu temp.