virtualbox.org

Seems this is same old topic, but doesn't go away.
I have XP-SP3 installed in my MacBookPro OSX 10.6.2, VirtualBox 3.1.4

Every thing was working just fine till yesterday. I shutdown both the OS and went home. Now the I cannot boot XP
I tried to boot it in "safe mode" and found that the boot is stuck after "Mup.sys". This issue suppose to be very old and already fixed (http://www.virtualbox.org/ticket/995), but I am hitting it again.

Browsing though topics in this forum, I tried everything:
a. Downgrading to VirtualBox 3.1.2
b. Change base and video memory from 1G and 32M to 512M and 64M (and few other experiments).
c. tried different combination of "PAE/NX", "PIIX4", "IO APIC", etc (I cannot find "APIC").
Nothing work

I wonder why it was working fine till yesterday (for around 3 months)? Perhaps there is some auto-update in XP or OSX with I am not aware of.
I am desperately looking for some help.
I can not risk uninstalling and deleting things, because all my important data is in this guest machine.

Post the latest log file for the guest (as an attachment)

This is the log I could find (hope this is the correct one):
/Users/Santosh/Library/VirtualBox/Machines/WinXP-EN/Logs/VBox.log

The log shows that you have VT-x and it is enabled but IOAPIC is not. Now DON"T do anything yet. I need you to answer a few questions.
(1) when you install Xp was the VT-x and IOAPIC turned on?
(2) do you remember changing anything when you shut down yesterday? Anything no matter how trivial it seems.
(3) Do you have any snapshots.

Here is the answer:
(1) when you install Xp was the VT-x and IOAPIC turned on?
Ans: VT-x - Enabled IOAPIC - Disabled

(2) do you remember changing anything when you shut down yesterday? Anything no matter how trivial it seems.
Ans: I run Windows in seamless mode. While shutting down there was some error in closing yahoo msgr (Windows "end program"), which I cannot access in seamless mode. So I exited the seamless mode and force close that program. Once the Windows started shutting down, I switch back to seamless mode. All went fine afterward.
No setting change.

(3) Do you have any snapshots.
Sorry, No

Thanks for your help

OK the first thing to do is make a backup of the XP VDI file. Copy will work.
It is a good thing that you do not have snapshots because this would have caused this to be irretrievable if you had.
Read this http://www.aitechsolutions.net/mupdotsysXPhang.html it explains what is really going on including a corrupt system which may have happened when you killed the process. (not sure about that).

You can turn the ACPI on and off with the command: It was removed from the GUI because you rarely need to change it.

After you have tried this then try to follow some of the suggestions in the article I sent.
Good Luck!

EDIT: if this fails and all else fails then you can create a new copy of XP and then attach this one as a second drive. That way you should be able to retrieve your data.
I can not stress enough that BACKUPS will save your bacon. I backup weekly. Have ever since I lost a years worth of work. That was over 20 years ago and you never forget it.

Thanks
I will try and post the status.
Really appreciate!