Sounds like you will need a new box, you could try a factory reset and if you have no recordings select the option to format the hard drive.
You will have to sign into your apps such as iPlayer, Prime, Netflix and ITV Hub again, also Match frame rate and Standby power consumption will go back to their default settings if you have changed them.
You can either call Virgin on 150 from a Virgin phone, mobile or landline, or 0345 454 1111 from any other phone to report a fault or wait here for one of the forum team team to pick this up which might be 2 to 3 day's.