HTC Sensation :: No SIM/SD Card Detected?

Recently, after cracking the screen on my HTC Sensation, I decided to have a go at replacing it myself.After changing the digitizer, the screen seemed to work ok however, the SIM card and the SD card are nolonger detected when inserted. I've tried numerous SIM cards, and none work (in other words, it's nothing to do with the SIM card nor the SIM card holder!). Everything else seems to work fine.

I disassembled/reassembled the phone again with the same result. From what I can tell, all four of the flexi connectors are correctly engaged.I performed a factory reset on the phone with the same result.I've inspected the flexi's/PCB's under a microscope and can see no component/flexi/PCB damage.I've blown the insides out with air to remove any potential debris shorts.All of the disassembly was performed on an ESD mat with ESD strap, so I don't think I've done any static damage.