This has only started recently and I don't know why.  I boot up the computer 
normally and after about 30 minutes or so, the thing shuts itself down and 
restarts without any prompting from me.  All of the programs seem to be working 
okay but if I'm in the middle of a document or an e-mail, it's gone.

Here's my system.

I'm running an HP Model 550 notebook computer with XP Service PackIII, Jaws 
10and Outlook Express.
I am connected to a generic USB hub which has 3 components attached to it:
1.  Soundblaster 5.5  USB sound card, HP Scanjet 4770, Brother HL1440  printer.
I also had a standard keyboard attached to the hub with an adapter which 
converts it from the smaller old style connector to a USB.
That's it.  

This whole thing started when I moved my computer from a table to my computer 
station.  I have never used this laptop with that USB hub before.  Before I do 
something stupid, can someone think this through and give me some pointers?
Could that USB hub be creating a problem?  It's not a powered one but one of 
those generic hubs you can get from Radio Shack.
I'm serious about this, friends.  If my computer is going on the fritz, I need 
to deal with it soon because in another 5 months, it's going out of warranty.
 Any help would be most welcome.

I have been using that standard style keyboard ever since I got this laptop and 
it has never given me a problem.  I have also connected the scanner and the 
printer directly to this laptop at various times and had no trouble at all.  
But I have never used this hub before.  Could it be sending some kind of reset 
message to my system?

 
John and Linda Justice  with guide dogs Jake and Zachary
Sent from my HP laptop computer.
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