Did changing the swithes to the 2nd 1MB bank fix the boot problem or was it the cables?
Here is the URL for the FlashBios Install
http://www.teamxecuter.com/flashbios/?CMSSESSID=7aeca362062ed198760b1e32853a66fd
Click the link for Xbins in my sig to find out about locationg bioses and other programs
I use the Dashboard UnleashX it works well for me
Also XBox Medis Center (XBMC) is also an Awesome App
If you wat to copy games to you HDD then you want to get DVD2XBOX this is an app that will run on your XBox and will copy the game using your DVD drive to your internal HDD
NOTE: Becareful with the Flash Bios install do not overwite your working copy of FlashBios normally you want to Flash with the X3 Bios on the oppsite bank of the working FlashBios
Example
If you have a working Flash Bios On the 2nd 1MB Bank
Since you have a 1.6 I would flash the 1st 1MB bank with 3.0.3 that way you have a working FlashBios in both 1MB Banks before you continue
Also check to see if you can boot to the back Bios by using the power + Eject button combo the Logo should show kind of like a pink color
If you cannot then you will want to falsh the Backup with 3.0.3 as well