1- it is fixable
2- I may or may not be compatible with boot2 bootmii. Your SN is not listed as known. Possibly it works.
3- Most likely the dvd drive is compatible with a modchip. Since you have opened it up, verify what drive is in the wii and what your modchip options are.
4- When the gc controller comes, do savemiifrii and find out what system menu is installed.
5- Try loading maintenance mod again. Turn the wii on, when the health screen loads hold + and -, then press A while holding + and -.
If maintenance mode does load, run the wii through the softmod any wii guide, get priiloader installed. Then go to the system settings and do a system format.
If maintenance mode does not load, get a modchip installed and get the wii softmoded following the disc loading instructions here- http://www.wiihacks.com/bricked-wii-...oot-disks.html
Have a look at the post regarding the use of smash stack via ssbb-pal, possibly the netflix disc if your wii is USA or 4.1 and below. Possibly a simple recovery disc but likely only to work if below 3.2 or the wii was modded with a patched system ios.
You may wish to burn a recovery disc an try loading it after savemiifrii, if you where lucky the wii would have dip patched system ios and it would load.
Also check the wii for boot2 bootmii installation, which would be nice. Remove all disc, sd, usb, gc stuff and turn on the wii. Look and the blue led drive light, 1 flash sucks because you don't have boot2 bootmii. Two flashes is awesome, indicating boot2 bootmii is installed.
There are many options depending on your current system menu. Post back with the details you find and I can give you a clearer path to follow. You'll need some good verbatim dvd5 r- disc, probably also some good verbatim dvd9 dl, + and - have both worked well for me. Your disc should be slow burn speed, 4-8x max if possible, burned at 4x max.
Nand programming requires a wii that is compatible with boot2 bootmii, which you may or may not have. With out boot2 bootmii compatibility a wii can not be nand programmed unless the nand keys are available, you do not appear to have the nand keys, so you could only reprogram if it was boot2 bootmii compatible. Typically it cost around $60ish, give or take. You should be able to fix this without nand programming.