I had the same problem as you. But first of all you should use a color bios so you know when the chip is working (the X when the xbox boot will be blue or red).
To get my matrix installed i used a piece of cotton with absolut vodka on it, and i rubbed it over the holes in on the xbox mobo (where the matrix is suppose to be installed)
rubb pretty hard over them so it gets clean (when you look at your cotton piece after it will be dirty) after that install matrix again check for the little green flash in mode 1, and then flip it to active mode. If it works the xbox logo will turn in another color then default green, if it doesnt work if it still boots 3 times and then the eject button flashes green/red then you need to clean the holes more. Do this over and over till you get it to work, it took me a few tries before it worked as it should.
Btw, i have a xbox european 1,1