Program your coolrunner with the appropriate JED/XSVF file(need xsvf if using nandpro to program). Make sure you have flipped the switch to PRG on the coolrunner and also flip the switch for Slim or Phat. If you are using QSB, then solder the QSB to the board.
Then solder the coolrunner wires. If not using a QSB, then solder connections for your nandx and the wires for the coolrunner to the appropriate points on the motherboard. LEAVE YOUR CPU_RST cable the full length it is! Do not cut.
Plug in your 360 power supply to the motherboard. Read your nand 3 times and save.
Next create ECC.bin. Then write ECC.bin. Unplug the USB from the programmer and unplug your 360 power supply.
Wait a few seconds, plug your 360 PSU back in. Press eject and wait for xell to load, could take a few reboots. When xell pops up either record your CPU key from the screen or take a quick picture and then look at the picture and record it.
Then create your freeBOOT image, flash your image, and test to make sure it boots.
Once confirmed working desolder your programmer wires if you didn't use a QSB, then put a piece of electrical tape over your CPU_RST and POST_OUT1 connections on the bottom of the motherboard so they don't move around. Your CPU_RST cable is really long, some suggest coiling it, but this can create problems. I kind of lay mine all over the top or bottom of the motherboard and tape it down with electrical tape so it cant move once I find a good position for it.
Wire install and QSB install diagrams for slim and phat are here in stickies:http://team-xecuter.com/forums/forumdisplay.php?f=175
Can't seem to boot? Never boot? Keeps resetting with no boot?
Did you remember to flash your glitch chip??? Did you flip the switch back from PRG to NOR??? Did you flip the switch for Slim or Phat??
Check soldering of course is always a good thing to check first.
Ensure you have no solder bridges and are connected to the right points.
Make sure your CPU_RST cable is not coiled tightly, electronic interference can mess with this cable I read as well, so make sure you keep it away from the little "coils" on the motherboard if you can. You might also try cutting this a little bit at a time to get it to work, last resort.
Sometimes a first boot or a boot after a successful boot might take long. If its taking more then a minute for first boot or boot after powering down, try just turning it off then right back on. Usually that second power on will be like 10-15 seconds boot.