Princeton 19" monitor flashing on and off when I turn it on.

Did you try this monitor with another PC and already verify that the VGA cable is OK.
Common problem with Princeton monitors are due to bad DC filter capacitors in the power supply board, see example here:

http://s807.photobucket.com/albums/yy352/budm/PRINCETON/

That is the problem with the standby section of the power supply. A continuous flashing indicate a shorted component usually a small diode.

More likely the power supply had failed, but more likely that it is already on its way out due to bad caps, see pictures here:
http://s807.photobucket.com/albums/yy352/budm/Princeton%20VL1918W/

http://s807.photobucket.com/albums/yy352/budm/Princeton%20VL2018W/

As you can see, 99% of failed monitors are due to bad caps.

http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Please post back what you find.

Two years is still new. Your monitor should last several years at least. I say should last, but the manufacturer will give you a 1 year warranty. Basically i year is nothing at all. I've had monitors from a variety of manufacturers and all have lasted at least 5 years and most lasting much longer. The monitors I'm referring to were used in a business and were on a minimum of 10 hours per day. I had some Princeton monitors that lasted equally long. You can complain to the manufacturer, but it may not get you any satisfaction.

If the monitor goes into power saving mode as soon as you turn your computer on then maybe your graphics card is only half-way in and not secured properly. I would first recommend plugging in a different monitor if you have one, if it doesn't get any signal either then read on. I had this issue, basically a couple screws need to be put back in because they have fallen out. The graphics card was only partially plugged in and the computer would run but not "communicate" with the monitor. If you are unsure how to do this then I recommend taking a trip to your nearest IT shop, the job takes only about 1 minute so you should have your computer back quickly. Hope this helps,

David

Welcome to FixYa! The default power saving feature is turning the monitor off. To change the settings go to the Desktop>Right click on it>Properties>Settings and you will see power saving settings where you can choose "Never turn off" or a longer time interval. These settings can also be found in your Control Panel for all of the Power Saving features for the computer, monitor and hard drive. Steve

Sounds like there is a capacitor in the power supply section that is failing to charge/discharge correctly. Is it under MFG warranty? If so I would send it in for repair.

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309

just press the fn + F5 buttons and screen will appear

If you feel confident take the monitor back cover off and replace the 3 bulged out capacitors

Looks like a power save program has hibernated your monitor. Look in Control panel settings to see if the power settings hibernate your monitor. Reset to never and this may fix your problem.

Drivers usually do not fail after 20 mins it is usually a software option set incorrectly.

Also, check the Bios program for correct settings or options.

I haven't had a Macintoch in a while but, this may give you some where to look for the solution

Good Luck

HJ