My Acer Aspire 4315 laptop screen won't com...

Sounds very familiar, as my wife had this happen twice in the past week on her Acer laptop.

The way I solved it was to completely shut down the laptop by depressing the power button for a minimum of 4 seconds. Then I removed the power cable and took out the battery back, which I kept out for more than 30 secs.

After I put the battery back in, re-connected the power cable and pressed the power button, everything worked like it should, as if nothing had happened.

I'm, not sure what caused it, but I have a sneaking suspicion it has something to do with overheating.

Hope this is helpful,
Good luck,

Michael