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Moving a site should not be taken lightly - I have not yet had to do it and dread the day when I do.
Have you got your templates_c folder present with the proper write permissions? This is a common one to check first.
How did you 'move' your site? You may well have to go through some kind of installation procedure so that the database on your new host knows about your XOOPS system? I can't help you there cause I never done it, but I would think it is not as simple as just moving the content from one host to another and updating the mainfile.php although I could well be wrong. If I am, then XOOPS is even better than I thought, and that's very very good!
Sorry I can't be of more help. There's loads of 'blank page' postings on this site though. I suggest you trawl through them if you can.