View Full Version : Cycling

22-09-2010, 02:29 PM
HP Pavilion a450a
Windows XP Home
Cycles through boot
Originally computer wouldn’t boot – hard drive faulty
Clean installed windows with new hard drive last week – successfully setup
Owner used the computer until 21st then started cycle through boot
-Attempt to boot to safe mode, gets to mup.sys and then reboots…cycles
-Tried another hdd with windows xp – same cycle pattern
-pulled audio & modem cards: no change still cycles
-pulled, cleaned & reseated ram: no change
-moved the ram to other available slot: no change
-tried another stick of ram 2x: no change
-unplugged front panel (usb, flashcard reader): no change
-disconnected the optical drive: no change

couple other incidentals that might help:
-owner does not have surge spike protection
-use Farmside broadband service

22-09-2010, 03:19 PM
I don't see a question in there...

Speedy Gonzales
22-09-2010, 03:20 PM
Here's what someone did


Or take your pick


22-09-2010, 03:24 PM
the question is how to stop the cycling through boot &/or boot normally

22-09-2010, 03:25 PM
I don't think it's a mup problem as it happens with 2 different hard drives.

Speedy Gonzales
22-09-2010, 03:27 PM
Did you install SP1, 2 or 3 before putting it on the net? If its on the net? Does it still hang on mup.sys when you choose safe mode?

22-09-2010, 03:28 PM
SP3 before internet and like I said, it has worked fine for a week after the new hdd & clean install

Speedy Gonzales
22-09-2010, 03:30 PM
Try another PSU, thats about the only thing you havent tried

22-09-2010, 03:31 PM

Speedy Gonzales
22-09-2010, 03:35 PM
Is this an AMD or Intel system?

22-09-2010, 03:37 PM
Intel Pentium 4 2.6ghz

22-09-2010, 03:40 PM
alternate power supply made no difference

Speedy Gonzales
22-09-2010, 03:43 PM
Could be a faulty CPU

As it says here


This XP cd, is it a restore cd or a normal / original XP cd?

Is the new hdd the same as the old one?

22-09-2010, 03:46 PM
This XP cd, is it a restore cd or a normal / original XP cd?
- It's a normal CD

Is the new hdd the same as the old one?[/QUOTE]
- That I am not sure, sent it away to data recovery

Speedy Gonzales
22-09-2010, 03:56 PM
It looks like this update

http://support.microsoft.com/kb/950749 if it was installed caused the mup.sys file to hang, and it also caused the constant rebooting in XP too

On one site, someone disabled USB in the BIOS, and managed to uninstall this update (if it was installed), and turned USB back on after. After that it was fine

And Mcafee and Norton if you in/uninstalled either could also cause this

22-09-2010, 03:59 PM
Cool, I'll look into this, but it will have to be Thurs am as I have to go, but I will report back.
Thank you.

ps no mcafee or norton

23-09-2010, 08:28 AM
Well, I would first of all inspect the mobo for any signs of bad capacitors.

My own recent experiences with an aging games machine had similar symptoms. Instability which rapidly decended to the point of being unable to boot (wouldn't pass POST). Pulling / swapping components did little to diagnose the fault.

The one component I couldn't swap (besides the mobo itself) was the graphics card (AGP).
Inspected the card, and found a tiny 'bleb' in one of the gold tracks where the board plugs into the interface. Ran a fingernail over the bleb and it flaked away, leaving a track that was either broken, or only 5% or less intact.
Ran a soldering iron over the area to repair the track, and voila - all magically working again.

This same graphics card had a bad cap replaced some months ago when issues first began.