Wii will not read the disc.

If Wii gives Disc Read Error, first step you need to check is to try another disc or clean the exisitng disc. This will confirm that problem is with either Wii or Disc. If the console itself is giving disc read error then it needs to be repaired. You may check out DIY Wii Fix Guide, that will show step by step information to fix the problem yourself. It also gives information on fixing many Wii Related Problems, so its a kind of Wii Problems Reference Fix Guide

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You'll have to send it to Nintendo to be repaired. Or you can buy a new Wii. (It'll probably cost as much to repair as replace.)

Whether this problem was caused by modifying the Wii or not is hard to say. It's probably just a broken DVD reader. In the future I suggest NOT modifying your consoles as this breaks the warranty.