As far as flashing the tsop, after you've soldered the write-enable points, you'll need to first get the xbox to boot. Try reseating all the connections (hard drive ide/power, dvd ide/power), and try to boot it. You might even try tapping the hard drive (it's failing as is, so don't worry about killing the drive). Then you'd need to load an exploit and flash.
If you can't get the box to boot at all, your only option is a chip. I wouldn't recomend removing your 29wire chip and installing it in this box... They're quite complicated and tempremental. If you've got one working, don't disturb it! Check the BST forums and pick up a chip. You can get a cheap one (duox2 lites are only $9 from oki-mod, and I think the duox2's are going for around $11 now) and make it temporary, or go all out and get a big chip like the x3 or smartxx v2 or xenium ice.
-Duck!