Acer - Aspire, Power, Veriton, Extensa, Ferrari, TravelMate, Altos
Press Del or F2 immediately after powering on.
The BIOS on the Acer Altos 600 server uses the Ctrl+Alt+Esc key and the F1 key for advanced options.
Older Acer computers may use also use the F1 or Ctrl+Alt+Esc keys to access BIOS.http://komku.blogspot.com/2008/03/how-to-update-acer-bios.html
If your keyboard is completely dysfunctional then you obviously won't be able to access bios, try getting an external keyboard and accessing BIOS with that