Have you checked in your power settings to make sure it is set up to do this?
Check in "Control Panel" and then "Power Options". Next click "Change plan settings", next to the one you are using and on the next screen click "Change advanced power settings". In this new window, check at least "Display" and "Hard Disk" to see if either is set to turn off at any point. You may wish to check the other setting areas as well.
Thanks but that’s not my case
I talk to a technician that told me that my motherboard
which is the emachine
MCP73VT -PM has that drawback,I ask him if I could
install an external GPU but he
told me that will happend the same.I think that I will have to buy another motherboard and
this is the second one.. We can not trust in buying things
that have been use it or old
like in ebay.