To start your MacBook Pro 2012 without a battery, follow these steps:
1. Unplug the MagSafe power cable: Disconnect the power cable from your MacBook Pro.
2. Hold down the Power button: Locate the Power button on your MacBook Pro’s keyboard and press and hold it for 10 seconds. This will help reset the system.
3. Connect the MagSafe power cable: While still holding down the Power button, connect the MagSafe power cable back to your MacBook Pro. Make sure it is properly connected.
4. Continue holding the Power button: Keep holding down the Power button for another 10 seconds. This will initiate the boot process.
5. Release the Power button: After holding down the Power button for the required time, release it. Your MacBook Pro should now start to boot up.
6. Troubleshoot if necessary: If your MacBook Pro does not start up after following these steps, there may be other underlying issues. You can try resetting the System Management Controller (SMC) by following the appropriate steps for your specific model of MacBook Pro. Additionally, you may want to consult Apple support or visit an authorized service provider for further assistance.
Please note that starting your MacBook Pro without a battery is not a recommended long-term solution. The battery provides backup power and helps regulate the overall functioning of the laptop. If you frequently need to use your MacBook Pro without a battery, it is recommended to have the battery replaced or serviced by an authorized technician.
I hope this helps you start your MacBook Pro successfully without a battery. If you have any further questions or need additional assistance, feel free to ask.