Not charging when plugged in

Plug turns green, orange then fades to blank in quick succession once plugged in. Not charging.

For the past month or so the charger has intermittently not charged when initially plugged in but would light up and charge after reinsertion.

Not sure if i have a 1.33ghz or a 1.2ghz

(laptop doesn't have enough power to come out of sleep now)

Charger is the original purchased w/ computer in late 04.

45W model# A1036

Battery was still holding a charge for several hours before charger failure