I just got my new lenovo and was just setting up the tablet when I had to leave the tablet when I had to leave the room for a min.

time to bin it and buy a new one

I don't think you can. Just open a google account even if you don't use it. After you get the tablet set up you can go back and delete the google account.

A Screen replacement doesn't change any settings on the tablet. What settings need changing?

Hey there! Because of your particular situation, you may have to perform a hard reset, as it seems the update process didn't complete successfully, leaving your tablet with a corrupt operating system. Before attempting this, please have the tablet charged up all the way so that the reset can complete fully without interruptions.

How to Hard Reset LENOVO A5500 (A8-50) with Hardware Button key:

1. Press together: POWER + VOLUME UP for about several seconds, then the warning will appear on the LENOVO A5500 (A8-50)
2. Choose: Reset Device, or Wipe data, or Clear eMMC, until you find an option that works for you
3. Doing the hard reset will clean all installed applications and all data will be lost or cleared while Resetting LENOVO A5500 (A8-50)

If the information provided does not fix your problem, here's a guide that will help you identify your remaining problem and should help you with solving it:
How to Easily Master Format LENOVO A5500 A8 50 with Safety Hard Reset

Thanks for your question!

you need to get it dismantled as its gone into the body of the tablet

You can release more storage room by going into Settings and then into Storage. Clear the cache to get more storage space. Some tablets have their storage divided into two partitions. The first one is usually 1 or 2 GBs. The second has the rest. You can go into your Settings and then into Apps/Applications, click on an app and see if there is a button to move the app from the tablet to the second partition, which can be named differently on different tablets (internal SD, external storage, SD, etc.) Move as many apps as are allowed. Know that apps that can be moved will not move the entire app, only a portion of it, but this will free up a lot of memory on you primary partition and often speed up your tablet. It is a good idea to leave some room (100-150 mb) on your primary storage partition, so you can download files. If it is too full, the tablet will not be able to download files.

Try a local phone repair shop, when you can't find a Lenovo certified repair centre. First ask them what it will cost you, then decide if you think it is worth repairing. Don't leave it without knowing what they will ask. A screen alone can be very expensive.

On your tablet, tap on Settings > Personal > Security. The reset to factory settings option will be near the bottom.

Reference: Lenovo Yoga Tablet 10 User Guide.

https://www.cellphones.ca/upload/manuals/lenovo-yoga-tablet-10-manual.pdf

Hope this helps!

You can just use a paper clip (straighten to a U shape) and short out the battery contacts.
If you are not sure, just leave the battery out for 20+ mins then put the battery back in the holder.
The BIOS settings will then be set back to th default settings, then go into the BIOS setting and set the Date and Time etc.