Monitor (hp 23xi & 25xi) displays "Scanning No Signal" then to sleep but other monitor works ok.

About 7 months ago I purchased an HP 23xi IPS to replace a burned out ViewSonic flat screen for my desktop (HP Pavilion a6050e, PN: GC382AV#ABA, SN:[Personal Information Removed] running Windows Vista Home Premium OEMAct 32 bit, with a NIVIDIA GeForce 7500 LE display adapter).  The 23xi worked perfectly until a few days ago at power up it just displayed “Scanning: No-Signal” as it scrolled through the auto-detect options (HDMI, VGA and HDMI).  After a couple scans it goes to sleep.  I checked the cables, switched between HDMI and VGA cables, tried new HDMI and VGA cables.  Finally I drug out my old hp pavilion mx90 CRT and connected via VGA and I finally got a normal signal (this is the only way I can write this). 
I tried multiple combinations of shutting down, unplugging, rebooting.  Convinced it was a problem with the 23xi I took it back to the retailer who was kind enough to give me an exchange with an upgrade to a brand new 25xi which I hooked up and ran the startup disk that it came with and still the same problem.  The startup disk dialog insists that the drivers are loaded but I don’t see it in my device manager.  I also downloaded the latest drivers for my video card from NIVIDIA and rebooted.  I ran a cleanup using Norton (fixed 3 invalid registries); still, no luck.  Again, no problems when using my old 30 lb mx90 monitor, screen saver is working too.
However, every once in a while I get a dialog box at start up describing a monitor failure (I didn’t think to copy the full text of the first one which stated, in part:
Problem event name: App Hang B1. 
App Name HP Display Installer.exe,.
version: 1.35.0.1,
Hang Sig: 71c1. Hang type: 0.
And the full text of the latest such dialog box reads:
Problem signature:
  Problem Event Name:       APPCRASH
  Application Name:            DTHtml.exe
  Application Version:         1.2.0.100
  Application Timestamp:   502ed5d6
  Fault Module Name:         pdi_nv_legacy.dll
  Fault Module Version:      1.0.0.1
  Fault Module Timestamp:               48473a21
  Exception Code:    c0000005
  Exception Offset:   00001927
  OS Version:            6.0.6002.2.2.0.768.3
  Locale ID:               1033
  Additional Information 1: aed1
  Additional Information 2: aad416d1892f5779e260a3742d62a0f4
  Additional Information 3: 8af1
  Additional Information 4: 3cc29b1a3adc5a2d247eb19195254d12
Any advise is hugely appreciated!
Thanks

Hi spica9,
Welcome to the HP Community! I see that you are having problems setting up your HP 23xi IPS. Try installing the drivers in safe mode in case something in Windows is blocking it. You can use the CD or go here to download the drivers. Another option is running the HP Support Assistant to see if detected anything that needs to be updated.
Thank you,
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