Sorry you are having troubles, IPADUSER78. But, do us a favor? Please do not post another plea an hour after your first one. This is an international forum and many people have not had a chance to look at your initial post - before you posted again. Please give it up to 48 hours for a reply and then, if you've received no answers, then you may post on the same problem again. Posting only an hour after your initial post is rude, will irritate those who read this thread (thus tempt them to not reply) and, lastly - it's against our rules. Thanks for your understanding.
Now - to your question.
Can you get to Cydia at all? Because that's what you want to do - get to Cydia and UNinstall the tweak you last put on the iPad that cause the loop. This should fix you booting errors/problems.
If you can't get to the icon to get to Cydia, can you put the iPad into Safe Mode? Safe Mode will allow the iPad to shut off the Mobile Substrate items that all, more than likely, causing the booting issue. If you can get to Safe Mode, then you can locate/open the Cydia icon, get to Cydia to uninstall that tweak.
If those don't work, by any chance did you install OpenSSH? There are ways to run commands from the PC to the iPad to put it into Safe Mode ... but it's no use describing the process unless you've installed OpenSSH.
Unfortunately, if you can't get to Cydia to uninstall that misbehaving tweak (or tweaks), then you will have to restore. So, try what I've suggested, if you can. Good luck and let us know how you get on.
Marilyn