it means that you most likely have a power issue, most likely a direct short exists somewhere in some component that is causing the power supply to shutdown if you don't know how to do basic troubleshooting, you will need to take it to a repair shop and have them try to determine what has failed
if removing the card allowed the system to boot then you either had the pci-e card installed incorrectly (misaligned in slot)
or if a M.2 format card, you are inserting the wrong type into the slot. M.2 is simply a formfactor the wiring to said M.2 can be different depending on what the mfgr decided to use the slot for examples are SATA or nvme or PCI (wireless card)
inserting the wrong type card in a M.2 socket can cause power pins on said card to be shorted
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