CPU upgrade help.. not working or need more power ?

Got a used CPU processor to replace my older less adequate cpu

Original AM2+ (says 95W Thermal Power):
http://support.gateway.com/s/Processors/4506517R/450651...

Replacement AM3 (what I got, which states 125W Thermal Power):
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

It looks great, no visual cues of wear and tear, but I can not get it to work. I know it's used and all. but I'm really hoping this guy was legit. He had a whole bunch of computer crap for sale in his garage so I'm thinking he's honest. My motherboard socket is AM2. From what I understand AM3 is widely supported in AM2/AM2+ sockets.

Now, what I notice is this:
With the original CPU (AM2+) my power button is lit up blue so it can be turned on and functional. But with the new replacement CPU (AM3) the light does not come on at all whatsoever. I can turn on the power and the fans, disc trays and other devices function, but I think that to be just basic functionality without a main brain. In this case the CPU. To me this would be a power issue right? But 30W only, is that enough to make a difference on an all stock PC?

The condition of the CPU looks great, came in original box, with original heatsink and manuals. If anyone has experienced this or maybe can diagnose this based on the symptoms listed above, I'd be very much appreciative. Thanks.


EDIT: Just saw this ---
http://support.gateway.com/s/MOTHERBD/Shared/4006254R/4...

Looks like it has to be under 89W to function on this motherboard I have. Is there any work around ? e.g. could I feed it more power