Laptop died, discovered shorted capacitor with a visual inspection, checked here and was able to find the cap value and replaced.

The laptop worked fine for a few days. Graphics stress tested and no problems.

The only problem was the battery showing 'plugged in' but not charging. Ran fine on AC and on battery until battery discharged. The next day, the laptop wouldn't start, only blinking blue LED and no power up.

Disconnected battery (Inc RTC battery), and now it switches on but shows 'CRITICAL BATTERY LOW' and powers off. No post or bios screen.​ Suspect...

Wow! Thank you so much!
Laptop died, discovered shorted capacitor with a visual inspection, checked here and was able to find the cap value and replaced.