If you know for 100% that the wireless card was previously working there are two possible explanations for the computer not booting up when the card was fitted. 1: A conflict between the card and the onboard wireless device. 2: A wireless device is listed in the BIOS as a boot option but the BIOS does not recognise the card.
Try, restoring the MBs default factory settings by removing the CMOS battery and leaving it out for a while, this would get rid of any possible bad settings that could be affecting the PCI-E slots, once this has been done, put the battery back in, reassemble, power up, reset the time and date etc then run Speccy to see what is reported for the PCI-E slots, if still reported as all being in use I suspect that slots may have been shorted out.
Try, restoring the MBs default factory settings by removing the CMOS battery and leaving it out for a while, this would get rid of any possible bad settings that could be affecting the PCI-E slots, once this has been done, put the battery back in, reassemble, power up, reset the time and date etc then run Speccy to see what is reported for the PCI-E slots, if still reported as all being in use I suspect that slots may have been shorted out.
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