Chosen Solution
Have an old MacBook Pro 13-inch mid-2008/early-2009 (the one with the two-part bottom). It’s not turning on, the charger turns orange, but trying to reset the SMC doesn’t appear to work, as I don’t get the confirmation blink turning to green. What do: This is an ‘as is’ computer I bought, so don’t have a lot of history on it except the owner claimed it worked when he last used it. Was stripped of RAM and HDD, so I put them in. No beeps when trying to start. Nothing! Not powering on at all, but charger indicator is Orange. Edit: Could this be the problem?
On the Left side is your systems battery checker
With the charger disconnected what happens when you press the button? Do you see the small 10 LED’s? Are only a few lit? Are they blinking?
To bypass the keyboard and attempt a spontaneous reboot, disconnect the battery and mag-safe. Press and hold the power button for 10 seconds. Reconnect the battery and then then mag-safe and if all is well and you have some charge in the battery, it should spontaneously reboot.