Could be various things, if you are not even getting the Acer Logo then it isn't even posting. Could be bad RAM, bad motherboard, bad CPU, low CMOS battery, frozen BIOS.
Remove the covers and reset the BIOS by remove the CMOS battery for 10mins, while the battery is out check the voltage - should be 3V or more.
If no better try replacing the RAM with known good or if you have 2 sticks of RAM remove one and try again. If no better you will probably need to take it to a tech