MacBook Pro 15" Mod- 2010 Odd issues. Won't turn on.

I shut my computer off using the button of doom prior to installing upgraded RAM and battery. I am a novice at computer repai and was hoping to do a quick upgrade to my now 10yr old computer. My computer was working great up until that point. Since then I have tried powering it on many times. It won’t budge no sounds, or screen just black. My magsafe does show green and my battery indicator light shows 100%. Before the battery was fully charged it did show amber, but no blinking or dim lights. I feel like Ive tried everything short of replacing the logic board I have tried:

• Replacing the old battery and RAM.
• Trying every combination of old/ new battery and old / new RAM.
• Double checked thqt the RAM WAS SEATED CORRECTLY
• Reseting the SMC & NVRAM
• unplugging the battery trying to run only on ac power.
• Holding power key for ten seconds, then pressing again.
• Disconnecting the keyboard and pwering with the powerpads on the logic board.
• Disconnecti g the keyboard and using
• Unplugging the battery for 5 seconds holding the power button then plugging the battery back in.
• Powering with the battery and ac adapter.

I Really dont want to have to replace the logicboard on a 10 year old computer, but I juat wantwed to see if anyone had any other suggestions.