System:  Acer TravelMate Notebook, Model: 2413 LCi (2410 series)
Operating System:  Windows XP, SP2

When I connect the ViewSonic VE150 external monitor I've been using for the last year, I now get the error message "Out of Range 23Hz/18KHz".  This is after I get the Acer splash screen and the Windows XP boot up splash screen during startup.  The VE150 drivers are correctly installed.  I can extend the desktop to the external monitor, but cannot make it the primary monitor.  The Acer email tech said “For this error message try booting to Safe Mode and make sure the display resolution is set for 1280x1024 and set the refresh rate to 75Hz.”  I tried this, but it didn’t work.  Is there a configuration ISSUE of some sort involved here?  Any ideas?

Try using something below [email protected]? [email protected] should always work.

What kind of videocards are you using? Ok, I tried the 800x600, 60 MHz setting - no chnage in behavior. 

On the settings box, I can APPLY the check box to extend the destop to the external monitor successfully, but when I check the "Use this device as the primary monitor" box, the Viewsonic goes black.

Video card in the laptop is Mobile Intel(R) 915GM/GMS,910GML Express Chipset, 128 Mb, Intel Video BIOS.Ah, you're using both the Laptop and an external monitor?

YEP, laptop has a cracked screen, had an extra monitor and VOILA!  Been working fine for the last year or so.Have you tried using the function BUTTONS to switch monitor from laptop to external? Yep, first thing I tried.Have you gone into Device Manager and checked to see what monitors are showing up?

Alan <><  I've been in device manager and both monitors show up.  I've tried disabling them and re-enabling them, but to no avail.  I've pretty much used up the standard troubleshooting methods.  I haven't yet tried to do anything with the registry, but that's a last resort.