Hi,
The advice to try with another template is a good one, we have to isolate the problem in order to help. Of course, another idea would be to try the same template with another blog, just for test.
Also, you could look carefully in the template you're using (and having problems with) to see the links to external sites. It could be that they are using a css file that is hosted on onother site (css could contains all the formating of the site). So, when that site is down you see a blank page because no formatting is applied. The same happens if they change the location of the css on that server.

For the moment I don't think at problems with your PC because all tghe files of a blog (both template and the content itself) are stored on the blogger site, so nothing to do with the PC. Let's test and see, let us know !

All best,
Radu