Strange Bluetooth issue.

Hi guys.

I finally got a new laptop. Same model as my previous one. However I have a really strange issue. A bit long winded but here goes.

I did a factory recovery using the built in partition and everything works fine. Apart from the harddrive itself being slow (on its way out possibly. It can't do windows updates without crashing) but apart from that. It works. Running home premium.

I switched the harddrive from my old laptop straight into the new one. (They're the same model. Same year etc . Samsung np305v5a)

And everything booted right up. I got to my previous desktop. Works fine. Except Bluetooth. Even with rolling back the drivers. Trying the newest. Everything. I can't get my Bluetooth devices to be detected on the old harddrive running win 7 ultimate. The adapter and drivers install fine. It just can't find the devices let alone connect. Thought i might have damaged the aerial. So I switched back to the laptops original harddrive to check . Bluetooth devices showed right up and connected (specifically a Bluetooth speaker) checked the driver versions. And they're identical on each harddrive. I'm quite tech savvy but what the hell am I missing? Been scratching my head for hours now .