Everything Broken when installed on Addon Domain

Greetings,

I have been using WordPress since long. It never failed me and I love it. Installations are my favorite part. However, I am facing some issue which I am unable to resolve.

I am trying to install WordPress on an Addon domain. Everything goes fine like DB, passwords, config file etc. However when I go to login or after login everything seems broken.

These are things which are missing/broken:
1) All images: WordPress logo, Close Button images (on dialog boxes), Down or Up images
2) Themes: None of the theme shows previews and even after applying or reloading the website Front-end still shows broken images and lacks functionality.
3) Styles and visual look: Everything seems more box type and neither rounded nor with those finishing.
4) Media, Backgrounds: Shows only broken images.

Apart from this everything (like connectivity etc) is fine.

I tried several things like automated installs, manual installs, config files. Really nothing helped much.

Please help.