I would like to add that not all 6751 Jasper BBs are glitchable. I have done somewhere around 20 BB Jaspers, and most work just fine but I have encountered 2 out of maybe 5 or 6 6751CB BB Jasper consoles that could not be glitched.
The wiring was just fine, but after flashing the .ecc file (built from the 6750 CB on 360 Multi Builder .7) the consoles would not load Xell. I use Xecuter Coolrunners, and I would see the green light blink anywhere from 1-3 times before it would just stop blinking. When I removed the 68nF capacitor from the coolrunner, it would blink somewhere between 1 and 10 times and then stop blinking.
I searched around quite a bit and did find a few more people with my exact same issue. It always seems to effect the Big Block 6751CB Jaspers, but not ALL of them. Some glitch just the same as any other console would.
Just something to keep in mind. Here is a topic I posted over at Xbox-Scene about the issue: http://forums.xbox-scene.com/index.php?showtopic=740198&st=0&gopid=4852041&#entry4852041
Hopefully your console isn't one of these