I won't lie, I suck at MDK. It came prepackaged with my first dell PC at the ripe young age of 13 or so and i've since lost it....that thing had a 16 gig hard drive man, it was intense!!!
Anyway I suck and I blow and so on and so forth and I need to use some cheats but I can't get the console to work in the GOG version and im befuddled by the fact that it seems like no one else ever on the internet has had the same problem. Any tips?

What exactly are you having an issue with? All you should need to do is hit the "~" key (found immediately to the left of the "1" key and above the TAB key), then type your cheat.

Looks like you're missing a closing bracket on your initial quote. I fixed it in my quote and it seems to be working fine.
Are you playing this on Vista? I have heard of console commands in other games not working due to permission issue or problems with UAC in Vista. You might try disabling UAC and running the game as an administrator (right-click on the sortcut and choose "Run as admin"). Even if your user account is an administrator account, applications still don't run with full admin permissions by default.

XP. I didn't have this problem with the cd version I had, its so strange I have to laugh. Eh, it's not the end of the world. I've been enjoying reliving my yoot'. But I'll be damned, I'd really like to know why this isn't working.

That is really strange, since I am running on XP and have no issues at all with it. It makes it really hard to troubleshoot as well. Is it possible that you are using a non-US English English keyboard that has the "~" key in a different location than the upper left position?

I'll check it out, but I bought this piece of crap at wal mart, and it sucks but up until now no problems ever. I just tried again before I checked this forum, and yes, its the same tilde key I used back at the age of 15 to try not to suck at half life...maybe my suckage is the problem....
Again it seems so ridiculous I would simply love to know what is going on over here.
For the record, thanks for the tips at least...!!!

I have the same problem, in windows vista, i tried to run the game in admin mode, and still the same. I wanted to jump some levels i played because i´m not in my gaming pc, but in a laptop, to continue my game where i left it. And i cant.
I´m still trying.