This error may occur if the registry entries and the drivers for the mass storage controller hardware in the backup computer are not installed in Windows. Download any reliable program like I always use Reginout to fix such errors by using its Repair Registry feature. And update drivers.
Boot device is inaccessible.
it means there is a serious issue with ur hard drive.
try booting with a bootable CD like a BART or Hiren's disc
u can the try to look at the HDD and see if it is a total loss.
If u can read it, first make a backup of stuff u don't ant to loose.
It may mean that u just blew ur MBR sector. There r various ways to fix this including a clean re-install of the OS
It may be that the HDD surface is damaged - new HDD
1) Since Runtime error 2400 is related to missing DLL files, you can re-register the registry list to fix Runtime error 2400 issue. For example, if you encounter Runtime error 2400 at dll files, to re-register the file, please do this:
1. Click Start-Run
2. Type in regsvr32 c:windowssystem32dllfile Download Repair tools
3. Re-start your computer
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