2nd WordPress subfolder install not visible on front end!

I have one WP site (2.9.2) installed successfully at:
https://s310666245.onlinehome.us

I needed a second WP site, so i installed WP again in a subfolder:
https://s310666245.onlinehome.us/sellonsolutions/

I am using 1and1.com for my hosting. I had created separate databases for the two sites, and incorporated the unique database information for each when installing the two different WP sites.

I got the second install to work in the subfolder and can see the site on the back end, but when I click “Visit Site” or “Preview Page”, I just get a completely blank screen. No error message, just blank.

I don’t know if something got messed up on the install, or if I have to do something different/unique for the 2nd site on my 1and1 SQL control panel, or what?

I have to have my 2nd site up and running before this coming Tuesday. I have all my text content ready to input, and wasn’t expecting this snag. Can anyone help me sort this out asap? Do I have to reinstall? Do I have to change something in my 1and1 settings? I’m not a techie and I don’t know php coding, so I’m at a loss as to how to proceed. Why can I see the site on the back end, but not the front? I’m hoping it’s something small and simple.

Any specific, speedy help would be GREATLY appreciated!!

Andrew