Monitor sudden change in color/print quality and flicker

I have an HP Pavilion a6112n desktop computer with Windows Vista Home Premium connected by VGA? (blue) cable to a Dell ST2220 monitor. Everything was fine when all of a sudden my monitor became difficult to read and there's a flicker on the screen, particularly when looking at the desktop or the opening start box. I can read most of the black print, but other print got very thin and faded. You can't even see the outline of search boxes, and the address box at the top shows some readable print like "hp.com" but the rest of the address is very very pale gray. My desktop background photo got washed out and also looks yellowish.
I thought it was my monitor, but I took the monitor to the office today and connected it to my office computer. Came on fine - no flicker and colors are great. Now I have no idea what to do next. Would appreciate any help. Thanks. (Not a computer expert!)

Hi again ncnash,
Thank you for the quick reply!
Since you were not able to restore the resolution to your desktop's display, I recommend trying a different cord, as well as a different monitor to your HP desktop.
If the issue continues, I suggest returning your system back to a restore point when the display was not fuzzy and flickering. This can be done by following the steps in this document on Using Microsoft System Restore (Windows Vista).
Should the display remain unchanged, I recommend performing a backup and recovery of your desktop's operating system. To do this, please follow this resource on Backing Up Your Files (Windows Vista), as well as Performing an HP System Recovery (Windows Vista). This should return your system back to factory defaults.
If the issue persists, please call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region.
http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html
I hope this helps!
Regards
MechPilot
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the right to say “Thanks” for helping!

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