This has been baffling me for a few weeks now.
I have an emachines laptop, its about 18 months old and I am on it every day working. While I am sat with the laptop on a table I have no problems but if I then move to the sofa and have the laptop on my lap, after about 15 minutes or so, the screen goes blank and the HD appears to come to a halt as there is little noise and hd light stops flashing. All other lights are still on but the only thing I can do is turn the laptop off and then back on.
I thought this is probably a overheating issue so purchased a 'laptop tray' with three fans in it but that has made no difference, I still have the problem.
Any advice would be appreciated