It seems odd that both boxes are showing the same error, however try the factory reset option as you've nothing to lose.
To factory reset go to Settings (the cog at the end of the Home menu) > System > Factory Reset. It's actually misnamed and only a partial system reset and not a complete factory reset. You are given 2 options
Normally I would advise selecting Choose Keep Recordings which means you won't lose your recordings or any links you've set up (but will have to sign into apps such as iPlayer, Prime, Netflix and ITV Hub again), however since you have the "can't find hard drive" message I would try the "Format Disk" option.
If that doesn't work then you can either leave it a few days for a member of the forum team to pick this up for you and book an engineer, or call faults.
You will get the appointment quicker by speaking to fauls.
Personally I would call 150 from a Virgin landline or mobile, or 0345 454 1111, option 2 (Faults) but try around 8am tomorrow when lines first open and are least busy.
When calling Faults you will hear the automated response asking you to press 1 for the link to online support etc
Ignore all the options and don't press any buttons then you should be placed into a queue and an agent should pick up the phone and book the tech for you.
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