Chosen Solution
It definitely needed a new battery, yet would that cause it to not turn on even when plugged in? More likely bigger issues, am I right? Any other reasons this may occur? I would like to save it. Thank you.
Follow this guide MacBook Pro 17" Unibody Battery Replacement remove the battery, then press and hold the power button for a good 2 minutes to make sure the system is fully discharged. Now plug in your MagSafe charger and try to start your system. Let us know what you hear or see.
