How did you install the WiiKey? Pics?
There are two most common reasons for this. First, bad install job, second, bad job burning (or bad quality media/burner).
If you installed via quicksolder...
. If you installed with wires, did you triple check all of your connections? It can get confusing down in there. Before you close up, you want to trace each wire AND give each side a good tugging.
Additionally, you need to make sure that there is nothing that will short out. Especially the four tiny points on the drive... they are VERY close together. If you strip back just the tiniest bit too much, they can touch. I use my own "shingling" method to make sure that this will not happen. Another good idea that someone mentioned is a dab of hot glue.
There is no "activation" necessary. This would only be the case if you were trying to play a game from another region. Then you may need to use the setup disc to enable region free, etc.
And Philips is not a media maker per se, meaning that you would need a disc identifier program to see who really is the maker of the dye, etc. This can let you know more about the quality of the discs. Anyhow, try other discs. Also try another drive if you can. I have many DVDRW drives, and they range from not burning usable games at all (even at slow speeds), to having a 50/50 chance of working, to never failing at all. Failures can happen even if the disc passes verification on your computer after burning.
So what burner did you use as well? And also try burning at 2.4x, this is what I generally burn at. I would do that until you are using a burner that has proven itself.
I have found that bad burns usually will let the disc show on the disc channel, but will give an error when launching, or video will stutter and it will mostly work, or it will give an error while launching the game. It really can vary, but in my experience, most will not give the same error as they would before the Wii was modded. If that is happening, I think most likely it is a botched install job
.
Anyhow, those are my tips, good luck!