Not Booting Up With Or Without Battery And Not Charging Macbook Pro 17 Unibody

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MBP Not booting up with or without battery and not charging , MagSafe with green steady light no orange , when I press battery meter on the side it flashes 1 light about 20 time quickly then quits on the battery indicator in the side … pls help

The blinking battery tester is telling us the battery needs replacing. Given the systems age it wound’t surprise me! Here’s the needed part & tools [linked product missing or disabled: IF162-035-2] and here’s the guide to do it MacBook Pro 17" Unibody Battery Replacement