External drive not recognised in Finder or Disk Utility on new Mini

Hi,
I've just bought a new Mac Mini and it won't recognise my Seagate Expansion drive in either Finder or Disk Utility. The drive is fully accessible on my old Macbook (running Snow Leopard), and ran fine on my old iMac running Mavericks. I've tried the troubleshooting tips in other threads - Seagate External Hard Drive does not work on Yosemite - but since they refer to people upgrading to Yosemite, I'm wondering if this might be down to the hardware in the latest Mini models? Any info or ideas on what to try next would be hugely appreciated!
Thanks.

- Do other external USB drives work on your Mini?
- If you go to System Report (click on Apple icon in upper left and select About this Mac>More Info>System report) what shows for the drive under Hardware>USB? Yo should see the enclosure chip as well as the drive itself.
- Tr resetting the SMC and PRAM
- If you purchased the Mac within the last 90 days you still have free telephone support
Complimentary Support (USA)

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External drive not recognised in Finder or Disk Utility on new Mini

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