I'll preface this by saying I'm the fool who never learns. I somehow get lured into having the "latest and greatest" version of OS X and it often leads to my own peril. The latest example of my gnat-sized brain at work was the installation of OS X 10.9 through a bona fide Apple Developer account. (I may be a fool but at least I didn't download a Torrent or pirated version.) So what's going on?
My installation of OSX 10.9 "Beta" (13A476u) has been a complete disaster. Mail crashes and neither Terminal nor the App Store icons work; double-clicking on the Terminal or App Store icon does nothing. Oddly enough, after installing OS X 10.9, my Ethernet no longer functions but WiFi does. Refreshing the DHCP lease always results in a 169.x.x.x IP address which, as we know, is reserved and will not link with my ISP. Another issue: The OS X installation disk that came with the iMac will not allow me to install it and, because the App Store application doesn't load, I can't download OS X 10.8 to re-install Mountain Lion. To make matters worse, I didn't do a backup so I now have a 27" i7 iMac that's useless.
Please don't rip me for being an idiot as I already know that's the case. All I can do now is warn others that it's best to wait for any given version of OS X to be released to the public, however "difficult" that may be.
In the meanwhile, any suggestions to get my Mac up and running again would be appreciated. Luckily, I don't have much of anything that's per se "important" on my computer (hence my nonchalance regarding backups) so I didn't incur data or monetary loss, just inconvenience.