TK1 refuses to boot with PCIe plugged in...

Hi

My TK1 refuses to boot with a miniPCIe card plugged in. Tried with a Intel 4965AGN with which it was able to boot and see the device (lspci), however not use the device (sadly). Also tried with a Intel Centrino Advanced N+Wimax 6250 which also wont allow booting when plugged in…
I have re-flashed to 19.3 with a new zImage to make the EDIMAX USB dongle work (which works fine)… I have been able to see the 4965 device in the 19.3 version previously…

What might be causing this? Any ideas?