http://www.instructables.com/id/Acer-Aspire-One-A-Guide-to-Dismantling/step3/Hard-resetting-CMOS/
In particular:
"If you're having a BIOS problem, clearing the CMOS might help you with this. However, if it does not revive your netbook, then flash it with the latest BIOS which can be downloaded from ACER site. Now, I was not able to locate the CMOS battery of my netbook that is why I did the hard-reset method. As you can see from the motherboard, look closely you will notice there are four memory chips on the board nicely aligned next to each other. A few millimeters to the right are two triangles with a small C1 printed next to them. Connect both triangles using conductive material, effectively shorting them, and press the power...