blank page after login

[Mithrus]

OK, I'm also getting the:

SERVICE CURRENTLY NOT AVAILABLE!

Error No. 1f4)

Then I found this which tells me how to solve the problem. However, I am not very wise with any of this stuff, so I have no clue what I have to do to check the following steps:

Make sure your php installation has mysql support enabled and check your database setting in db.inc.php

Also, check to make sure that your db.inc.php file is readable by the web server process. Some documentation recommends chmod 600 db.inc.php but a chmod 644 db.inc.php under a differently configured system will be just as secure and will alleviate this error message.

Would anyone be able to give me a more step-by-step guide as to how I do these two things? Any help is greatly appreciated.

Thanks.

Again, sorry to bump, but I can't figure out how to fix this.