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Sounds like a monitor problem but check your power options in your control panel to make sure all your settings are rite go to control panel open up Power options make sure your power scheme is set to home/office desk and check the turn off monitor make sure thats about 40 min most likely your monitor is bad
You're probably lucky that this happened now. You're most likely still covered under warranty. Contact Acer support and arrange a swap. If your pc works okay with another monitor there's no point in troubleshooting further. Get that monitor switched before the warranty runs out.
did you changed frequency of that monitor? if it is out of factory setting that could be the problem, try to connect it again as secondary and set Hz to default, if that does n't work try same settings on both monitors? i have connected two monitors i had same problems , my secondary monitor was clone for tv if you are using secondary monitor for clone to ty (with s-video or whateever) if tv is old it must be 60HZ 800x600...
I have the same model after youlet it sit for a long enough period to cool down it will come back on and work normal, it is a cooling problem called gateway and they confirmed this theproblem I ran in to was what fan this computer has 3. temp fix I used was to remove the tower cover to allow better air flow try this till you can figure out what fan is messing up