Can't connect to Software Update or Mac App Store.

I can't connect to the Mac App Store or to Software update, and all Apple wants me to do is call Apple Care. Has anyone else had this problem before?

I've tried deleting the .plist files as suggested in other places, but I'm having no luck. I know it's happened since the supplemental update/iTunes 10.6 update because I was able to connect just fine before that.

Any thoughts or ideas on this one?

 

Really? I wonder if that's the problem. I'll do a hardware check later. This machine still has the stock RAM in it, so it's not a third party issue. However, it might be that.

I talked to Apple yesterday, and they had me do a disk check. I had many problems with the disk, repaired it, but that didn't do anything to fix my problems. I can't call them again right now, but I'll try again later.

Thanks for the reply!