What is wrong with my network adaptor?

[Head]

Okay, so I've never had any problems at all with my network adaptor for the PS2, I've always gotten online perfectly. Just the other day though, I took it our to put it on another PS2 for a little bit. After moving it back to my PS2 and trying to get online though, it keeps on saying no network adaptor is found. I thought I could have just not put it in right or somthing, but I've taken it out and put it in about five times, always to see that no adaptor is found. Keep in mind that I never had any problems installing it, and was able to do it right really quickly the first time I got it.

Does anybody have any idea what could be going on?

[Boomer]

Hmm. Can't think of many things. Make sure the prongs or whatever are going in right. Make sure it isn't tightened in too much. That's about all I can think of at the moment.

[Xero]

Maybe try and see if you can get it working with the network adaptor disc?