please see attached photos. switch on PC and screen is black. No boot menu.

Bios boot set up click CD drive and get Ubuntu
click Toshiba 500 GB HDD and get windows
Click Kingston SSD drive and get Windows.

Have included photos of Edit Mountpoints but not 100% sure how to complete the boxes. Obviously the kingston one is wrong.

Please could anyone advise or sent photos of a similar set up.
In the bios when I click the CD drive Ubuntu appears complete with boot menu. windows starts on both Kingston and Toshiba drives. all start and work as normal
I keep my CD/DVD drive as first boot because I like trying different distros.

I just need the details to fill in the boxes in Edit Mountpoints. I have a bit of an idea but not 100% confident and I dont want to mess anything up. Thanks

So sorry. I forgot to attach the photos

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I and other possible helpers can probably help you better by having you boot to Ubuntu and paste here input and output enclosed in code tags here from a terminal session:

In so sorry I do apologise and appreciate your help. Hope this is clearer When I boot up the PC I get a black screen. If I enter the bios/boot file and click on the CD drive it starts the OS and brings up the boot menu. I dont want to have to go into the bios to get the boot menu every time I boot up. I think the problem lies in the mounting points. Please see attached photos. Thanks for your help

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The images you posted have tiny fonts and are practically impossible to read. All I could make out from them is that you have two physical dirves with an EFI install of windows on one (sdb) and a Linux (Ubuntu) install on another. If you bought this computer with windows 10 preinstalled, it is almost certainly an EFI install so go to the link below which is the official Ubuntu documentation on dual booting with windows 10 and compare the instructions there to what you did.

https://help.ubuntu.com/community/UEFI

Posting the output of the commands suggested in code tags would have made the output much easier to read.
Also, you only posted the first part of the cat /etc/fstab command and left out the important part.

sorry forgot to add this (update-grub)

Hi, I have had this PC about 6 years and no problems with it booting up on different distros. The PC is custom built and I installed windows myself.
Im sorry about the small print I thought it would have been possible for you to enlarge. I apologise.
I used the Boot repair disk and it said successful. I did ask for a printout but cant find the address of the email given.
New development. Boot repair disk no longer works. It boots into the session and remains there. I have tried two different disks.
I will attach the photos again plus bios and grub screen
Thank you for your help

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You were asked to post text, wrapped in code tags, not pictures. You ignored this [very reasonable] request. When you need help then you want to attract as many helpers as possible, right? Currently you are alienating them. Make it easy for them to help you.

sorry I dont know how to do text wrapped in code tags. I will find out and try again

The request for text wrapped in code tags included a howto link.

When you run boot repair, there is an option to "Create BootInfo Summary" which you need to select. When that finishes, you should see a small window which shows a URL which is what you need to copy here. That will give details on the system and someone should be able to help.

Do you know how to mount partitions? If so, mount the vfat partition (sdb5) which is likely the EFI partition and take a look at it to see if there is a directory there named ubuntu. If not, you have installed windows EFI and Ubuntu Legacy but this is just a guess. Also, you did not post the full output of the blkid command as sda1 does not appear but the fstab output shows the / filesystem of Ubuntu is on sda1.