MacBook Pro Freezes when Screensaver is on for a while...

Hello all,
I am experiencing a quite odd issue... I have the most basic, natively-distributed screensaver for my MacBook Pro. Lately, when the screensaver runs for a while, the mac freezes... I have to shut it down by pressing continuously the Power On/Off button... Then, it has some difficulty to 'find' the Hard Disk... The 'swirl' icon in the grey screen freezes as well... So I have to turn it off, wait for a couple of minutes, then turn it on again and... voila! It works... I reset the PRAM, nothing has changed... Any ideas please? I am covered by Apple Care 3-year warranty; is it worth to taking it to the Apple Store in London? Many thanks!

It could also be a heat issue. Macs are designed to performa safety shutdown if the temps approcah a level that could damage something. For the CPU in a silver-keyboard MBP, its around 100C/212F.
Like you. I try to run simple 2D savers that don't overwork the CPU and GPU but even they can cause some heat. Is the bottom of the case on a hard surface so air can flow beneath? Is the hinge area on the back edge unobstructed? The back edge is an important heat outlet.
Have you used Activity Monitor (or "AM"--it's in Applications > Utilities) to see if a background process is eating up processor cycles and therefore making more heat? If you've not used AM before, be sure to change its' "Show" window (upper right edge of the application window) from the default of "My Processes" to "All Processes" to get the big picture.
You can check temps with this free DashBoard widget:
http://www.apple.com/downloads/dashboard/status/istatpro.html

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    0x41cbbb78 : 0x4045db (0x49b794 0x41cbbbb0 0x41cbbba8 0x27fca000)
    0x41cbbb98 : 0x40ab74 (0x41cbbbb0 0x49bdbc 0x3c 0x404dc1)
    0x41cbbc28 : 0x3eb79c (0x27fca000 0x0 0x1 0x40cb29)
    0x41cbbc48 : 0x3eb869 (0x27fca000 0x0 0x40d8c90 0x27fca000)
    0x41cbbc68 : 0xf317c2 (0x27fca000 0x240d0000 0x40d8c90 0x8176790)
    0x41cbbc98 : 0x40fc65 (0x240d0000 0x4128410 0x4128410 0x0)
    0x41cbbce8 : 0x43afc3 (0x240d0000 0x4128410 0x4128410 0x0)
    0x41cbbd48 : 0x18d18b (0x240d0000 0x4128410 0x0 0x0)
    0x41cbbdb8 : 0x12d17e (0x8176778 0xbea6890 0x41cbbdf8 0x11ee14)
    0x41cbbdf8 : 0x126257 (0x8176700 0x40d49e0 0x1ace780 0x0)
    0x41cbbf08 : 0x1973dd (0x41cbbf44 0x0 0x0 0x0)
    0x41cbbfc8 : 0x19f3b3 (0x4c1c120 0x0 0x1a20b5 0x41383c8)
    No mapping exists for frame pointer
    Backtrace terminated-invalid frame pointer 0xbfffdca8
    Kernel loadable modules in backtrace (with dependencies):
    com.apple.GeForce(5.2.8)@0xf1d000->0xfabfff
    dependency: com.apple.NVDAResman(5.2.8)@0xae9000
    dependency: com.apple.iokit.IONDRVSupport(1.5.2)@0xadb000
    dependency: com.apple.iokit.IOPCIFamily(2.4.1)@0x5c1000
    dependency: com.apple.iokit.IOGraphicsFamily(1.5.2)@0x7cb000
    BSD process name corresponding to current thread: ScreenSaverEngin
    Mac OS version:
    9E17
    Kernel version:
    Darwin Kernel Version 9.4.0: Mon Jun 9 19:30:53 PDT 2008; root:xnu-1228.5.20~1/RELEASE_I386
    System model name: MacBookPro3,1 (Mac-F4238BC8)

    Happy Birthday, young grandma
    It may just be the particular screensaver you are using - try another. Is it one of the defaults or one you downloaded or created?
    Also, you might creating a fresh user to test.
    Create a new account, name it "test" and see how your problem screensaver works in that User acct? (That will tell if your problem is systemwide or limited to your User acct.) This account is just for test, do nothing further with it.
    Open System Preferences >> Accounts >> "+" make it an admin account.
    If the problem is present in the test account also, then it is systemwide. In this case try repairing this with the 10.5.4 Combo Update . This is a fuller install, as opposed to an incremental "delta" update so it should overwrite any files that are damaged or missing. It does not matter if you have applied it before.
    Remember to Verify Disk before update and repair permissions after update from /Applications/Utilities/Disk Utility.
    Until it's sorted, you can use Screen Sleep in Energy Saver.
    -mj

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