Can you provide any links ot where it says it is supported?
Are tehre any BIOS updates for your system?
these are two different references I'm using for the specs, one being the acer's own page, and both say that it should work. As far as BIOS upgrades I don't really know much about them.
Take the CPU back out and with a good magnifying glass look for any BENT PINS in the CPU socket , Sometimes if you are real careful you can straighten them with a tooth pick. If they are bent real bad you are looking at a new board.