can't boot to ANY boot disc

Well finally some good news regarding what started this post. I was finding it impossible to boot to cd no matter what types of recovery discs I used... refer to the 1st post and I list them. I spoke with 4 different techs where I bought the computer, none of them could figure out why I couldn't boot to disc.

Hours of troubleshooting later here is how it was finally resolved. I am now able to boot to any type of recovery cd providing I do the following.

1) unplug all my USB devices except keyboard and mouse
2) go into bios and ENABLE legacy USB, save and exit
3) insert recovery disc... reboot and press any key at the prompt
4) wala.... finally a boot to CD occurs properly
5) in the case of linux recovery discs for acronis... once it actually boots to their start page (within the recovery cd environment, I am able to then plug in my external drive, I can than continue on and then see the image on the external drive.
*whether it can be successfully recovered remains to be seen, but at least I can now access it.
6) After escaping out and removing the recovery disc, I can reboot... go back into bios and DISABLE the legacy USB setting.
7) Rehook up all my extraneous USB devices and carry on

The shame of all this is someone at this forum did recommend the enable USB legacy, and I did try it, but I got a catostrophic crash, and couldn't even enter into the bios to fix it. That is why I had ruled out using that advice. HOWEVER, when that all occurred, all my USB devices were connected to the computer, I made the change in the bios... and then it was instant black screen upon save and reboot.

So I guess I'll mark this solved, but I still have no clue as to why I can't boot to CD if USB legacy is disabled, and I have NO idea why it would be required to have it enabled in order to do something as important as being able to boot to an emergency recovery CD or even the Windows 7 install disc.

So thanks to everyone who tried to help! - Carl

Hey Hammerhead, I have some business I need to take care of over the next couple days, so I really can't do much troubleshooting until after that. I will try and first start trying installing usb cables one at a time as you suggested and see if I can determine any try to narrow down, what device might me causing the problem. These are the USB devices I have attached on a consistent basis:
-USB Keyboard , Mouse .... both corded Logitech that came with computer
-3 TB USB3 external drive (plugged into usb3 port)
-1 TB USB2 external drive
-wacom graphic pen/tablet
-m-audio USB device to hook up midi keyboard
-Some cheap USB multi photo card reader
-USB belkin network adaptor
-A firewire cord that I occasionally plug into a video camera
-A mini hdmi cord that goes from my graphics card to a regular TV

When talking to my computer manufacturer (SYX) I asked them about the chipset drivers... I know nothing about them, but this is what they told me... the chipset drivers listed on the attached image, are the only ones which the manufacturer has sent them. I have no idea if they are up to date or how to go about even telling what should be in there. I would ABSOLUTELY have to make sure first, since the unit is still under warranty, if I would void my warranty by updating the drivers.

But honestly I would never attempt it on my own.... I have had awful luck in the past updating drivers in general, and these critical drivers make me realize there is certain things I just shouldn't do on my own..... so after looking at what they say on attachments below, give me your thoughts. A final thought on the drivers ... where can I find what chipset drivers are truly on my computer so that I can make a screencapture?. The list below comes from a support website,they could be what came when the machine shipped from the factory, but I would want to make absolutely sure what chipset drivers are actually on my machine.

The saga continues..... again....

Hammerhead, I called my PC support and discussed what you mentioned... so they checked and said there was a new update done on 3/13/12 ... but the one he had me do was different... here is the link to what he had me download and install

MSI Global ? Mainboard - P67A-C43 (B3) take note of the first file you see .. its called Intel management engine driver for 6x series. It says system and chipset drivers in the description.

So before doing the update... I determined the USB3 drive, plugged into the USB3 port that was causing the blackscreen upon restart. (remember USB legacy is enabled). Everytime I unplugged the usb3 drive I was able to boot properly... so I created a system restore point, and unplugged all external drives.

Than we did the update, . So after the update we shutdown, plug back in the USB3 drive and then all of a sudden (while usb 3 is plugged in) it boots and doesn't Black screen.... yippee right? Not so fast....

So I shut down and hook up the USB 2 drive along with the usb 3 drive.... restart.... Instant black screen again. As soon as I take out the USB 2 drive.. reboot ... no blackscreen. So somehow after this update... it completely reversed the problem I was having with the 2 drives.. now the USB 2 drive is causing the black screens

So as it stands right now...

CurrentState.... after motherboard drivers update
With USB legacy enabled, trying different combinations of hookups during troubleshooting this is what occurs:

-If Only USB 3 drive plugged into USB 3 port - Windows boots fine
-If Only USB 2 drive plugged into USB2 port - Windows boots fine
-If BOTH USB 3 drive and USB 2 drive are Plugged in to USB 2 ports - Windows boots fine
-USB 3 drive plugged into USB 3 port and USB 2 drive plugged into USB2 port - BLACK SCREEN

Let me clarify something.... We did the download yesterday of the 1st item in that link .. intel management engine driver. I am thinking that download may have had a combination of motherboard updates ... including hopefully... the sandy bridge driver among other things. If you look carefully by going to the link... looking at that first download that I installed yesterday... It shows "type" and it says..... system & chipset drivers

But I would like to confirm what chipset driver is actually on my computer.... How do I do that ? How can I explore my hardrive or device manager settings and see specifically what is the chipset driver that is on my computer after I did this installation?

From what I found out from my computer person, that list only represents what they have been given as the most recent drivers for your computer... it doesn't mean that they have been installed on your computer. Thats why I want to find a way of determining what chipset is now running on my system after this install.

From the Western Digital Forums I have been looking at, it is appearing to me that the real problem I am having is due more to issues around the harddrvies... there are a lot of complaints from people about system freezes, almost all the "fixes" or workarounds the first option is to
-disable USB legacy
There is also other recommendations such as
-Disable USB boot and some people have talked about a WD SES driver that causes some problems.