Is it under warranty? If so, Acer should be sending someone to you to fix it. And if it's a fairly new unit, like within 30 days old, you should easily be able to declare yours a lemon and get a replacement.
I have an Acer Aspire Desktop M1202. Having multiple problems with it and hate it. Now, computer shuts down on its own (monitor shuts off but CPU power light is on and doesn't respond when pressed). I have had to unplug power and tried holding down power button to reset (did nothing). The only way to restart seems to be to unplug, wait, re-plug then go thru reboot. Then after a while of use or non-use same thing happens. Tried to restore that didn't help either. Running Windows 7. Also, system hangs forever at auto detecting mass usb storage devices upon startup. Can't take it back and WILL NOT deal with ACER (techs there are useless!). If I return to ACER to fix, they will make me pay to ship to them and can't afford that right now. Any suggestions are greatly appreciated!