Dual Monitor works when first set up, but when system restarted reverts to single laptop monitor

Hi, I have been running a laptop with a monitor also attached, so using dual monitor/ display. The external monitor is the identified as 1 with the laptop LCD 2 when I restarted it would restart in the dual mode, no problems. Everything has been fine for over 1 year then about a week ago, on restart it starts in single monitor (LCD only) once logged in goes to dual monitor, but keeps making the laptop the primary monitor. So I change it via Display, all ok then restart and back to starting in LCD screen only.
I'm running XP pro, I then a system restore, loaded new drivers, load new software from ATI for RAdeon, still not fixed. Does anyone have any ideas ?
Phil500Asked:
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ITcrowConnect With a Mentor Commented:

Checkout the BIOS, there might be an option to enable LCD or External Monitor or Both
( AGP / AGP + .... / AGP+ ... + .... )

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CallandorConnect With a Mentor Commented:
Try it with another monitor - your laptop may be having problems sensing that an external monitor is attached and is reverting to single display mode.  This could be the monitor getting old.
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Phil500Author Commented:
I've got it working, tried the BIOS and everything thing else but made it worse. Manage to do a system rstore from about 2 months ago. It seemed to fix it. Still don't know what was wrong.
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ITcrowCommented:
Cool! It's good that you got it working.
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