Laptop switchable graphics error

Hi, im using an Acer ASPIRE timeline X the 4820TG-6847 one and recently it just blacked out and wouldn't turn on overnight now when i booted it up earlier this afternoon it worked but for some reason it doesn't bring up the switchable graphics options that is normally accessed through right clicking the desktop also normally it automatically switches to the high gpu settings when im plugged in but now it wont any ideas on how to fix this?
 
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