Take it back out and see how it goes? If it works, go into the BIOS and make sure it is set to allow 'auto' or 'detect' graphics output method. It might still use the onboard output. You could try ...
One key reason your laptop might not boot up without a battery is the power settings in the BIOS or UEFI. So, make sure that power-related settings are correctly configured in the BIOS/UEFI. First, ...
The first step that you should do is perform a hard reset. Sometimes, the problem occurs due to the residual charge. In this case, hard resetting your PC can help to fix this issue. This process will ...