Early 2008 Mac Pro won't start.

Early 2008 Mac Pro. Spelt some liquid on top that ran down front of computer. Tilted it back to wipe underneath and it shut down. Now it will not start. Processor fan runs full speed and that's it.

Hello,
My Friend spilt a drink on their laptop and the device started to smoke.
My suggestion is to get a hair tight container fill it with rice and put your computer in it, and leave it for 1-2 days.
The rice should absorb most of the water, and hopefully it should work again.
If it does turn on make sure you check the lights under the keys!
If they still don't work my suggestions are to take it in to an Apple store.
Good Luck!
I wish the best for your fellow Mac!

Similar Messages

  • Early 2008 Mac Pro Won't Boot

    I have an early 2008 mac pro that will not boot. Power turns on, power LED turns solid, but no display ever comes up and it never chimes. I have tried swapping out RAM, hard drives, disconnecting all peripherals... any other suggestions? Dead logic board?
    ... and yes, I was too dumb to buy the AppleCare. Stupidest move I have ever made...

    Hi I think I have a similar problem.
    My Mac Pro 8 core doesn't start up. When I turn it on here's what it does: the boot up sound > the grey/white screen with the apple logo and the little turning gear thing > then it freezes.
    Sometimes after that the screen either goes blue with nothing but a mouse pointer that's moveable. but no login window. I can access the hardrive by network and weird enough it's booting on safe mode. I tried setting the SMC firmware but it didn't work. I took it to an apple store and when they plugged it into their displays it worked. When I brought it back, I plugged it into my Cinema Display 30" and the same problem started again. I reset the SMC firmware again and tried different displays I have at home but had the same problem. I plugged the 30" display into a Macbook Pro and it worked fine so I know that the display is not the problem. I've heard the the Nvidia 7300GT has caused problems but why would it work in the apple store? Any help out there?

  • Early 2008 mac pro won't boot from hdd when ssd is installed

    I have Mountain Lion 10.8.3 installed on my 1TB HDD in my early 2008 mac pro.  That is the only OS install on my mac.  I have an OWC SSD formatted but left as an empty drive that I am trying to use but when it's installed my mac hangs on the blank gray screen.
    My mac cold boots fine and runs fine when the SSD is *not* installed.  When I shut down and put the SSD into a drive bay the mac does seem to boot ok the first time, but when the computer is off for a while it will not boot.  It just hangs on the blank gray screen (no apple logo).    As soon as I pull out the SSD, the computer boots fine and runs fine again.  I am not trying to boot off the SSD, I am booting off the HDD.  The correct drive (1tb hdd) is selected in startup disk.
    OWC has been helping me and I have tested 3 SSD's.  So it does not appear to be a problem with their drive.
    The mac will boot into safe mode with the SSD installed.  It will boot if I choose the boot drive with the option key at startup.
    Mountain Lion was clean installed.
    Could it be some sort of library pref or cache issue?
    Any recommendations on what to try?

    A HT does not find a lot of errors.
    It doesn't look for bad sectors or directory or file problems.
    Clone your SSD now that you have a clean OS and has the Apple updates on it. Before you make changes.
    Install TRIM Enabler 2.2+ on it and any boot volume, to enable TRIM and so that Disk Utility's Repair Disk will trim cells. Mountain Lion Recovery won't  which is a shame, so...
    Clone and keep bootable backup clone of your system to use for maintenance.
    A really bad directory on a system drive will cause interference from booting.
    SSDs really need extra care, and even with TRIM, to be repaired from time to time and couple times a year, to do an erase and restore from a current image.
    Of course Mac OS system even iwth apps is small and doesn't need to have any data or media and fits on 120GB usually just fine and still have a good enough amount free so TRIM and Garbage Collection can work properly and not get low on free pages. But 20GB free should be the minimum free, and better to have more, at least whatever total amount is written out in a month.

  • Early 2008 Mac Pro won't boot after installing 2nd DVD drive

    All,
    I purchased a Pioneer DVR-117D from Mac Sales and after installing it in my new refurbished 2008 Mac Pro it won't boot. My MP will boot if I remove the drive. According to the Mac Sales website this drive should work fine in my MP. Any ideas as to why this is happening. I literally just got my MP today and installed the drive. Is it the drive or the Mac Pro. Thank you all.

    The drive was set to master, I switched it to CS before I left for work but haven't tried reinstalling it. I will try when I get back and let you know if it worked. Thank you again.

  • Late 2008 Mac Pro won't start -- help! Hangs up on Airport: RSN handshake complete on en2.

    Hello Mac Pro user,
    I have a late 2008 Mac Pro. It will not start anymore. The computer chimes and then goes to the Apple icon screen with spinning cursor, but then it freezes and goes no further. 
    So I did a single user start up [shift command S],then I let the info. load on the black screen, and found that the system hangs up at this line: Airport: RSN handshake complete on en2.  Does anyone know what to do?
    How do I get it to boot up again?
    Thanks,
    Yvette

    pull the drives you have. ]
    F'ind a way to do a clean system install on another drive.
    Clone your user data to another drive also.
    ie, create a new solid foundation.
    but until your repair your drives, by booting off another device, don't use them. Pull them for now.

  • Early 2008 MacBook Pro won't start up

    My early 2008 macbook won't start up. It worked fine two days ago but won't start up now. The battery has full charge and my MagSafe charger is amber. The fan runs but no screen (it's dark), no apple logo, no chime. It sounds like it wants to start but doesn't. I did a SMC  and a PRAM, but to no avail. I know I need to do a disk utility and a disk permissions. I don't know what else to do. Can someone help me?

    Hi,
    Try to boot in safe mode by holding the Schift key during booting your Mac.
    Read this article ...
    http://support.apple.com/kb/ht1564
    Dimaxum

  • Early 2008 MacBook Pro won't start up (Nvidia Chip?)

    Even though over the last 4 hours I have read many threads on this, I thought I would start a new one just incase as my particular issue didn't start the same as the others
    I sould start with explaining what happened…
    In OsX Lion I was having some problems with Launchpad so I decided to quit the process in Activity Monitor in order to restart the feature (admittedly this may not be the correct way to do this) then almost immediately after I clicked, the screen went a kind grey/green colour and the computer didn't respond to anything at all.    I then preformed a force "shut down" on my mac.  Unfortunately my machine would not start up again at all.  
    I have tried all the tricks given in the many threads on this and will be taking my laptop to an expert in the New Year but in the meantime it would be great if anyone had any suggestions or advice?! 
    Thanks in advance.

    smallcolin wrote:
    Here is how my situation stands as of now (if anyone cares)…
    I need to replace the logic board entirely.  As it turns out the problem does not lie with the Nvidia chip but with an electrical fault somewhere else on the board.  Its frustrating as **** (and expensive) but instead of getting the repairs done I bought a brand new 13" MBP yesterday.   It is very nice so every cloud and all that…
    I hate to tell you this but if the computer will not boot Apple will tell you it is not the video chip. That is becasue without the system starting Apple can not run any diagnostics on it and in trurn can not go back to NVidia for the cost of some of the repairs.
    It very well may of been the video chip that caused the Ligic board failure but you will never get Apple to admit it.
    Good luck with your new MBP.

  • Early 2008 Mac Pro frequently shut downs during start up, Help!

    Hello all,
    My early 2008 Mac Pro has gradually started having the following problems:
    It will often shut down when it goes to sleep.
    It has shut down randomly a few times.
    And just today it shut down about 5-10 seconds after being turned on. It took about 6 tries before I could get it to turn on.
    I have tried all of theusual software remedies (disk utility, different startup drives, resetting the SMC, PRAM, etc.)
    I have run apple hardware test on loop for several hours with no errors appearing...
    The computer also often loads up to a circle with with a slash through the middle sign, though I am not sure if this is related (it started happening when it switched my system over to a SSD).
    I am wondering if this is simply a slowly sying PSU and if replacing it might help? If there any way of monitoring this perhaps? I somehow thought that if it was the PSU then it would simply die completely rather than fade like this...
    Any ideas much appreciated!

    There are multiple threads and reports of issues with Icy Dock - there is one on Amazon that lines up properly.
    The drive sled length of 2009-2012 Mac Pro are longer. Maybe OWC needs to be clearer.
    You'e right half-way and maybe some corrupt plist or interferring process you have, or even another hardware item or cable - external - even printer drivers or something that refuses or does not like sleep. Controller card?
    All around I'd have to vote for Samsung 830 model. Then Intel 520. Crucial is out with x4 now (Or is it "V"?)
    SSD firmware continues to be trouble. Even May-June the SandForce firmware had major issue and reason to hold off any using theirs. Reason to see if yours needed to be updated. Someone last week with m4 found they had old firmware and needed to update it.

  • Early 2008 Mac Pro - Can't load Boot Camp drivers for Win 7 64

    Trying to install Win 7 64 bit on my early 2008 Mac Pro.  I downloaded the Boot Camp drivers 4.0.4033 and installed them on a USB drive but, for some reason, when I try the install them during the process, I get a message that my hardware is not recognized.  Skipping the driver loading process, I am able to install Win 7 but when the system trys to restart to continue the install, I get a message "disk error, press any key to restart".  Pressing any key does not get me anywhere.  I went through the Win 7 repair process and again tried to load the drivers with no luck. 
    Any thoughts would be appreciated.
    Thank you,

    That article was also my starting point and I have followed those steps again and again and again. I haven't slept, I haven't done anything other then try to make it work for more hours than I can count. I came here for help because that solution is not working for me.
    The region and keyboard type settings simply don't have the Apple keyboard layout listed. As I said, someone on the Fusion forum tried to follow the article's instructions too and he managed to get it working because he COULD run setup.exe (Boot Camp Drivers) on his machine, and I CAN'T. Yes, it is all explained in that article... but the drivers WON'T INSTALL, I get an error message saying "This version of Boot Camp is not intended for this computer model".
    First you said it wasn't physically possible for me to install the drivers, then you said I should just follow the article. Well, the article clearly says "Install the Boot Camp Windows device drivers in the virtual machine" which you just said couldn't be done! I want to cry. I should have just bought a second laptop, this is too painful.

  • Why are there so many problems with the early 2008 Mac Pro ???

    Hi everybody out there using Mac Pro's early 2008,
    I found out there is a lot of problems with the early 2008 Mac Pro.
    My early 2008 Mac Pro has been repaired ones under warranty and now it stopped working again ! Also see under: Mac Pro early 2008 no chime and does not start up. Why is this ????
    It worked well for about 2 years and then it just fails and i had this failing issue twice already !!! Is this just a BAD Apple product or how do you think I need to approach this. Let’s face it, these machine don’t come cheap and you at least expect them to work without problems for 4-5 years. What is happening here ???
    Cheers, Kavango

    go to a black screen after 15 minutes or a couple hours
    That is probably an indication that you need to find a new graphics card.
    RE: Mac Pro Replacement Graphics cards
    1) Apple brand cards,
    2) "sold in the Apple store" cards, and
    3) "Mac Edition" cards ...
    ... show all the screens, including Boot up screens, Safe Mode, Installer, Recovery, debug screens, and Alt/Option boot screens. At this writing, these choices include:
    1) Apple brand cards:
    • Apple-firmware 5770, about US$250** works near full speed in every model Mac Pro, Drivers in 10.6.5
    • Apple-firmware 5870, about US$450
    2) "sold in the Apple store" cards
    • NVIDIA Quadro 4000, about US$1200
    • NVIDIA Quadro 5000, about US$2500
    3) "Mac Edition" cards -- REQUIRE 10.8.3 or later:
    • SAPPHIRE HD 7950 3GB GDDR5 MAC Edition, about US$480** Vendor recommends Mac Pro 4,1
    • EVGA GTX 680 Mac Edition, about US$600
    The cards above require no more than the provided two 6-pin aux power connectors provided in the Mac Pro through 2012 model. Aux cables may not be provided for third-party cards, but are readily available.
    If you are Meet ALL of these:
    • running 10.8.3 or later AND
    • don't care about "no boot screens" etc AND
    • can re-wire or otherwise "work out" the power cabling, THEN:
    You can use many more cards, even most "PC-only cards"

  • I have an early 2008 Mac Pro, which has re-booting problems. Also what does the spinning beach-ball indicate?

    Hi, I have an early 2008 Mac Pro which has re-booting problems.
    Processor speed is: 2.8
    Memory: 2GB 800 MHz DDR2 FB-DIMM
    2 x 28GHz Quad Core Intel Xeon
    I am running OSX Yosemite Version 10.10
    My Mac Pro keeps re-booting. Last year I had to replace my graphics card. My original card was the ATI Radeon HD 2600 XT 255MB, and that is what I have now. At this precise moment my Mac Pro is running perfectly, except that it is slow and the spinning beach-ball keeps appearing. I have managed to do some work with the disk utilities, verifying, cleaning and partitioning. Some errors were found and when it was cleaned this seemed to help my Mac Pro to function properly. Although I am able to use my Mac Pro now, from day to day I still experience re-boot problems. Also quite unexpectedly my mac dictionary has an error, it closed itself down and will not open at all, I had the message to say that a report will be sent to Apple.
    I have tried starting my computer with an external hard drive fitted via a USB cable, I use for back-ups. This worked and I was able to wipe my hard drive clear and replace all info from the back up I had done only a few days ago.
    This worked for a few days and then the same problem started again.
    I am beginning to wonder if I need to buy a new hard drive.
    If there is anyone who has some answers to help me solve my problem, I would be most grateful.
    Robert

    When you have the beachball activity, note the exact time: hour, minute, second.  
    These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
    Launch the Console application in any of the following ways:
    ☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
    ☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
    ☞ Open LaunchPad and start typing the name.
    The title of the Console window should be All Messages. If it isn't, select
              SYSTEM LOG QUERIES ▹ All Messages
    from the log list on the left. If you don't see that list, select
              View ▹ Show Log List
    from the menu bar at the top of the screen.
    Each message in the log begins with the date and time when it was entered. Scroll back to the time you noted above.
    Select the messages entered from then until the end of the episode, or until they start to repeat, whichever comes first.
    Copy the messages to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
    The log contains a vast amount of information, almost all of it useless for solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
    Please don't indiscriminately dump thousands of lines from the log into this discussion.
    Please don't post screenshots of log messages—post the text.
    Some private information, such as your name, may appear in the log. Anonymize before posting.

  • Early 2008 Mac Pro + ATI Radeon HD 4870 = Not working

    Just took delivery of my new HD 4870 video card today. I installed it in my Early 2008 Mac Pro and booted up. I got a picture no problem on one monitor, but nothing on the other. Furthermore, the display perfpane was missing a lot of controls, like Arrangement and Detect Displays and whatnot.
    I did a bunch of rebooting and swapping of cables, and determined that both the mini-display port and the standard DVI connection will drive a monitor. However, if both are plugged in, the only active display is the one plugged into the mini-display port, and there's no option to setup the secondary display.
    So I booted into bootcamp, and it automatically recognized both display ports, and mirrored my desktop on both monitors. I downloaded and installed the latest windows drivers, rebooted the machine into windows once more, and was able to configure a multiple monitor display with no problem.
    This tells me it's not the card and it's not the motherboard.
    Booting back into mac OS, I discovered that it doesn't even recognize that the card has video ram. It thought I had no video ram in the system.
    So, this all leads me to the conclusion that Apple shipped me a card that it has not yet provided driver support for.
    Hey Apple, can I have my 4870 display driver now?

    Hi again,
    It was funny to read all your answers on my iPhone while away from my computer. I could have reply on the iPhone but I preferred to wait to give you all the procedure I used to install the beta driver successfully this morning.
    To start, I found this link:
    http://www.insanelymac.com/forum/index.php?showtopic=155477
    and followed the "4870 INSTRUCTIONS", starting like suggested by doing the "First, follow the 4850 INSTRUCTIONS above"... (See the link)
    I would like also to specify that I did this without having installed the card physically yet. So I kept my HD 2600 in the computer, followed all the steps excepted for the step 3:
    3. Reboot with -f -v (kextcache/verbose mode)
    There is no -f nor -v switches available for the reboot command at the shell prompt. I simply rebooted as usual "Pomme -> Redémarrer".
    After the reboot, all my software was still working as expected with my HD 2600 card, meaning that these steps are specific and active only for the HD 4870 when it's detected at boot-up.
    You may have to Google for the string "Kext" in order to get the application to install the file ATY_Motmot.kext. For your information, ATY_Motmot filename is the same string as the one found under "System Information ->PCI cards" under "Name".
    I get:
    ATI Radeon HD 4870:
    Name: ATY, Motmot
    The article is not clear regarding where to find the OpenGL.framework to backup before installing the downloaded one. I found mine under:
    /Developer/SDKs/MacOSX10.5.sdk/System/Library/Frameworks/OpenGL.framework
    After having shutdown the computer, just after the reboot that proofed everything was ok, I removed the original HD 2600 card and put back the new HD 4870 and boot up...
    Then I check the "System Information" and found both "Quartz Extreme" and "Core image" supported!
    I launched Aperture, got it!
    I launched Final Cut Express, got it!
    I launched Starry Night Pro Plus, got it! Then I checked the OpenGL settings in Starry Night Pro PLus and activated both options:
    Use shaders where available
    Use AllSky shader (Not compatible with all hardware)
    When I was doing these actions with my original HD 2600 card, the software was giving me a warning that my hardware did not support these options and that it could crash.
    This time, with the HD 4870, it accepted my settings and give me back a very beautiful blue sky with much more shades!
    So in conclusion, it works very smoothtly with my system and I am writing this with two monitors, having bought the MiniDP to DVI adapter this afternoon
    I am happy!
    P.S.: A girl from Apple support called me back this afternoon regarding my problem. She was very happy two when I told her that I did apply the beta driver and that it was working very well...
    Good luck and best regards...

  • Early 2008 Mac Pro + nVidia 8800: Never going to work?

    This forum is littered with threads about early 2008 Mac Pros with the nVidia 8800 card - none of them positive.
    I was unfortunate enough to wait for Apple to release such a machine and buy it. Graphics performance is dire given the hardware available. The machine routinely crashes with the window manager hang problem (the user interface just locks up, yet network services etc. still work), in the way familiar to anyone blighted by this particular bug; just run the Folding@Home client on your machine if you want to experience the joy. Or screensavers, sometimes, so I've had to turn those off. And I've had to turn off monitor power saving too, because I too suffer from the 'monitors sometimes don't wake up' bug. And of course I can't sleep the machine either, because firmware upgrade or not, it's still not reliable. And after all this, still the machine crashes.
    SSH to the machine; try to restart cleanly; even 'sudo reboot' won't restart it. Apple have achieved something I've never seen out of any Unix or Unix-like operating system, ever; the kernel is unable to kill its own processes.
    There have been no indications from Apple that I've seen on these forums over several weeks that the problem is even being acknowledged, let alone tackled. Latest reports indicate that even the 1st gen Mac Pro owners are suffering if they install the 8800.
    http://discussions.apple.com/thread.jspa?threadID=1460752&tstart=0
    My machine rarely makes it through the day without a forced reboot due to the window manager hanging. I can't do any work on it. I can't rely on it. I can't enjoy it. I can't even use it for web browsing without fear of it hanging.
    There seem to be no facts about this at all. So all I can ask for is opinions. Does anyone have any offering of hope that early 2008 Mac Pros might ever work properly with 8800 cards? Y'know, little things, like actually being able to handle graphics? Or sleeping the monitors? Or, heaven forbid, sleeping the whole machine? Or should I just send it back as unfit for purpose?
    Yours, tired and exasperated... :-/

    I posted this in some other blog (forum), I should have posted this here also but I hope this gives you and all with these problems hope!! I also ran some fish tank test some else posted to get the folding problem to happen and I can not get it to happen at all now, and since my 8800 went in I get NO LOCKUPS, SCREEN FREEZES, shaky blurry video when I boot, so far NOTHING, IT JUST WORKS!!!!!!!!
    Now that I think about it the person who said to use the fish tank program had a bad 8800 and maybe you do also!! here is the link to that:
    http://discussions.apple.com/thread.jspa?messageID=6965475&#6965475
    I purchased my first mac pro early 08 2 months ago (amazon.com).
    2 quad core 2.8's, 2 gig apple 4 gig OWC total 6 gig ram,2-WD raptors (1st mac 2nd boot camp winxp 32 bit), apple care.
    I had all my problems with the ATI card (I always purchased ATI, never Nvidia, for all the PC's I built) a couple of times I bought the first ones out, these had all kinds of problems until good drivers that actually worked were released (usually 6-12 months after the release of the card).
    So I try not to buy routers, graphic cards, etc.. for at least 6-12 months, but back to my 2600 card!!
    When I received my mac the graphics would freeze, I did a lot of online reading only to find out the ATI 2600 was the problem, the cure was to hook up 2 monitors to the card (and that worked!!).
    Then they came out with the firmware update, now my main monitor would after 2 days on a reboot be scambled (samsung syncmaster 213t, NEVER had ANY problem with it before on any PC I had, so I knew it was not the monitor) to fix the problem I had to either turn power off to the syncmaster or resetting PRAM (worked for a couple more days, then the same problem).
    I called apple and they sent a tech out within days to replace the ATI card, the replacement did the same thing after a couple of days, so I called Apple back and they took a bunch of info from my computer (BTW not much at all loaded in the mac side) and said to call back in a week, so I called back a week later and they said they were going to exchange the card for either another ati 2600 or the Nvidia 8800, I said 8800 and a day later on a saturday I received it, swapped the card and NEVER HAD ANY PROBLEMS at all!!
    So I don't know if the ATI card has problems with certain monitors or they are just poorly made (maybe AMD is mad with Apple that Apple did not use AMD processors).
    I have read others that swapped with the 8800 and their problems went away also!!!!
    Maybe some have no problems with the 2600, but I would not recommend it to anyone, if you can avoid the 2600 GO WITH THE 8800, the drivers will get better (and the 8800 will eventually outperform the ATI)and you will not be sorry.
    Apple is awesome, they are 2nd to none, their is no other company like this anymore that I have dealt with in a long time (not just because they gave me a 8800), like I said in the beginning of this post I always purchased ATI cards and would have kept it if it would have worked but 2 doing the same, ATI [AMD] has lost my support until they prove otherwise.
    I recommend Mac's to everyone now!!
    good luck and let me know it any of this has helped!!!!!!!!!!

  • Early 2008 Mac Pro wakes up from sleep with Mavericks.

    Ever since I upgraded to OSX Mavericks on Tuesday, my early 2008 Mac Pro keeps waking up from sleep mode every couple hours. It goes back to sleep again on its own though after a minute, so I'm thinking it's some kind of new automated feature that I'm not aware of. With the Mac Pro being fairly loud when it wakes up from sleep mode, it woke me up three times last night! Is there some kind of option in the system preferences that I'm not aware of that can deactivate this new behavior? I usually only shut down my computer once a week, and keep it in sleep mode when I'm not using it most of the time, but I'm going to have to start shutting it down every  night now to keep it from waking me up throughout the night...

    Hello MARl0,
    You may want to disable the Power Nap functionality, if available, in System Preferences -> Energy Saver.
    OS X Mavericks: Change Power Nap settings
    http://support.apple.com/kb/PH14391
    Cheers,
    Allen

  • Problem on my early 2008 Mac Pro

    I had this problem with my early 2008 Mac Pro which started last week.
    Some background; I'm using 8GB RAMs, using Snow Leopard and bootcamp Windows 7 and 3 days before the start of the problem, I had replaced the original 320GB HDD for 640GB HDD and reinstalled both OSes.
    While I was playing some videos in Windows 7 last week, it displayed the blue screen with memory dump message and restarted on its own. Thereafter, I was unable to load Windows 7 and SL respectively, both hung before they can be loaded. In SL, I noticed that there were some faint red dots in the Apple logo and subsequently, the entire screen started to flicker with some random black and white strips. In Windows 7, it frozen at the Windows logo with a 640x480 resolution. My default resolution was 1920x1200. However, I managed to loaded into the safe mode of Windows and extracted my work.
    I tried to re-install SL and it hung again at the Apple logo followed by the flickering.
    I sent it to my local service centre and the technician removed my video card, RAMs and memory risers and cleaned the contact, ran the stress test overnight, AHT3A152 and ASD3S123 tests and concluded that he found no issues with the hardwares and the problem did not occur again.
    The Mac Pro was sent back to me today and earlier, I started up with no problem and decided to remove the Windows partition and I restarted it again to confirm everything was ok. However, at the next startup, the problem re-surfaced and I could no longer start up my Mac Pro in SL.
    I tried to swopped back the original 320GB HDD, but the problem still persists. Before I send back my Mac Pro to the service centre tomorrow, I would like to have some 2nd opinions. Based on my description, what is the likely cause of this problem, is the newly replaced 640GB be the root cause?

    Do you keep Windows on its own hard drive?
    I would have kept the 320GB while using Windows WD Lifeguard to test, zero, run extended tests and slow long format of the new WD 640. Then just cloned system to new drive.
    Casper 6.0 seems to be great utility if you want to avoid reinstalling 7, though I've found 7 to be fast and easy to install even with dozens of programs to add.
    Are you using the current / latest graphic driver for 7? I don't notice you even list which card.
    RAM - there is no perfect test, AHT finds some while Memtest takes time and may find others.
    Windows may be more sensitive to weak hard drive sectors and memory than Mac OS or than HFS+.
    Do you have any 3rd party devices? PCIe? Cables etc?
    And you can't boot off Windows 7 DVD or Safe Mode?
    Windows should automatically offer to boot in Safe Mode.
    Also, try restore from last good restore point.

Maybe you are looking for