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Elitebook 850 G1 wont boot after mainboard replacement

Elitebook 850 G1
Microsoft Windows 10 (64-bit)

Hi, we've just had a mainboard replaced on an Elitebook 850 G1 and now Windows 10 wont start.  HP tech's arent being too helpful as the machine came with Windows 8 and was upgraded.  I get the preparing automatic repair screen and then the advanced troubleshoting options.  Startup repair gets nowhere.  In Command Prompt cant see any partitions. DISPART/list disk says "There are no fixed disks to show".


I booted to a Windows 10 bootable USB and a DVD and same issue.


At the suggestion of HP I tried setting boot mode to Legacy and UEFI Hybrid modes and no different.  I tried changing the boot order with M2.SATA and SATA drive and no difference.


I booted to the original Windows 8 recovery DVD as far as selecting a drive/partition to install on and can see the 4 partitions and all looks OK.


I'm running out of ideas and really dont want to do a full reinstall as the machine has a lot of app's and would need some very time consuming configuration


Any suggestions?




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