That's it! (This may be your excuse to upgrade your obsolete Mac. frown )

According to Mactracker these are your power adapter's specs:

"Power Adapter: 45 W Apple Power Adapter (M8576**/A)"

Hope this helps.

The new Great Equalizer is the SEND button.

In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire