re: Mup.sys? Hangs but not? Wha's happening?
Friday, December 28, 2007 at 7:51 am
Windows XP Annoyances Discussion Forum
Posted by cdavis999
(2 messages posted)
On Monday, December 17, 2007 at 12:10 am, Vincent wrote:
>I have also encountered same problem with my laptop(mup.sys) i hope someone here
>can offer some help.
The 'hang at MUP.SYS' problem appears to occur when XP's USB system somehow loses
track of the installed USB devices. Repairing it via the usual recovery methods is
hellish, but there's a simple way to get XP to re-scan the USB devices and sort itself
out.
The first time this happened to me - a few days back - I used the 'unplug USB device
at hang' method described at http://70.85.203.226/windowsxp/wwwboard/forum/97354.html
. In my case it was a USB wireless mouse, and the method worked fine.
Try this first, and it may work for you. It goes like this:
1) Start up the system, and try to boot into Safe Mode. The display of loaded drivers
begins.
2) The system hangs at MUP.SYS (in fact, it's not MUP that has failed).
3) Unplug the mouse or whatever you have plugged into the USB ports.
4) WAIT - this takes a loong time, and looks just like a hang except that you should
see hard disk activity.
5) The screen should clear after a while. More waiting and disking.
6) Eventually the machine should do a normal safe mode boot.
I figured it was a one-off problem, and forgot about it, but last night it happened
again and the unplug didn't work. I think I may have switched USB ports before I
tried it or something. At any rate the fix wouldn't work.
Based on the theory - pointed to by the fix - that the problem happens when XP screws
up its USB settings, and needs to rebuild its USB inventory to start properly again,
I decided to rattle the USB system's cage a bit.
I opened up the laptop and disconnected the (USB) DVD drive and the USB keyboard.
While I was at it I pulled the HD drive out, too. Then I started the machine. Having
nothing else to boot from it just went round in circles trying to boot from the LAN
for a while, until I forced a shut down again.
Then I put the drive back in and restarted. Voila! Same loooong pause with the disk
access light going, and finally it booted OK. I stayed in Safe Mode and ran a diskcheck.
It completed with No Errors Found, so I rebooted into normal mode.
To me, the point is proven: you need to mess with the USB system enough to get XP
to reset/rebuild its (registry?) values, and then everything's fine.
This info must be made more widely known. People are replacing their entire machines
to fix the problem.
CD
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