MacBook Severe Freezing Problem

Hopefully someone can help as this is driving me slowly nuts!!
I've got a MacBook Core Duo (upgraded to 1GB Ram and 100GB hard drive by apple at purchase) which freezes with alarming regularity. The MacBook is just over a year old.
The freezing is not tied to any program or any user account and can happen at seemingly random times.
The freeze lasts for about a minute before everything resumes as if nothing has happened. During the freeze, CmdAltesc doesn't work, and I can't click anything, although the clock in the menu bar continues to work and I can still get expose to move the windows around! If I'm downloading something, the status bar freezes but then updates itself as if it has been downloading in the background whilst everything was stuck.
I've tried creating a new user account (still freezes), zapped the PRAM (still freezes) and clean reinstalled OS X (had several freezes during the actual install process!!). I've also tried dumping the plists for Finder, Sidebar, iTunes and Safari but with no success. I've also let Onyx run the full monty, but again this seems to have no effect. TechTool also reports that everything is okay.
I'm now typing this on a clean install of OS X (fully updated) with no user programs installed and guess what? Yep, the computer has frozen six times whilst I type this - and no other programs are running, only Safari.
Does this sound like a hardware issue rather than a software issue? Anybody any ideas?
MacBook Mac OS X (10.4.10)

Okay, I reformatted the hard drive and reset all values to zero. Having reinstalled OS X, the problem is now even worse!!
The "welcome to os x" screens took 15 minutes to complete, with major freezes between each screen. Having finally managed to get into OS X, every single thing I do causes the system to hang. Doesn't matter what program I'm in. Even finder hangs all the time.
Is it time to take the computer to the Genius bar whilst it's free of all my junk, and still having the same problems?

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