When i turn on my computer my monitor lights up and i can read it then the back light goes out after about 2 seconds,all the information on the monitor is still there just dark i have a mag innovision model 500p

You can try to do the monitor self test.
Monitor Self Test:
1. Physically test the monitor autonomously from the computer.2. Switch both the monitor and the computer off, and then disconnect the VGA cable le from the computer.3. Turn the monitor on, pressing the power button for about three seconds. The self-test screen will come up .4. If the image is clear, bright, and shows red, green, and blue, the monitor is working properly. Video issues may be due to the video resolution in the computer, and not the monitor.5. If the image is not apparent and intense or the colors are not accurate, then the trouble is with the monitor or some of the (OSD) settings. In this case, test your particular monitor's information for OSD.
It is always important to check the color of your power light for so you can distinguish if the monitor is defective. Getting red lights on the the power panel states that the power section of the monitor is faulty.

Sounds like either there is a bad connection from the computer to the monitor, or the monitor has a faulty power regulator, causing the monitor to overheat prematurely, and shut off.

The inverter that turns on the back light may be bad - it's suppose to create the high voltage pulses to fire the CCFL back light lamps. Apparently the back light turns on after a few seconds however, it cannot stay on because the inverter might be bad. If you connect a known external CCFL lamp to the to the inverter output you can isolate the inverter.

Very typical of View Sonic. Sounds like a back backlight or inverter. I would go to www.viewsonic.com and open up a RMA. Most view sonic screens have a 3 year warranty. They will repair at no cost ..(if it is within that period) There is a date code on the back of the screen that will help you validate the above information.

pandres, Your monitor will need troubleshooting to find out reason why the 2 "cold-cathode-fluorescent-lamps" fail to remain lighted. They provide "white light" so you can see what is on the lcd panel. Connect a "known good" monitor to your pc to prove monitor is bad. If pc is ok, then your monitor will need repair. This type problem not new and is very common for all brands of ccfl back-lit lcd monitors. Watch some video clips at YOUTUBE that show disassembly and repair of ccfl lcd monitors. Read fixya profiles of "budmrtn" buddymc" "12fixlouie" for more information. 12fixlouie

it sounds as if you may have a backlight problem..i have two of them that the wire going to the backlight had burnt off at the bulb..I had to take the lcd screen apart to solder the wire back on the blub.. be carefull the lcd screen and bulb are frigile... ther is 4 lights two on the top and two on the bottom..good luck

This could be one of two problems, the light in your monitor has a loose cable, or the light is dying. I have seen cold cathode lights that are about 10-15$ to buy and many instructions on putting them in yourself.

Solution 2, your cable is loose on the back of the monitor. Make sure you have the screws tightened on either side of the vga or dvi cable, both on the back of your monitor and on the back of your computer or laptop.

Beautiful screen, lasts about for a few minutes, goes black. Power button still green. If I turn it off, and then back on, it works again for a while. Any ideas?

check power section.check pf capacitors in this section for ok or replace them.
Hope this be of initial help/idea. Pls post back as requested, how things turned up or should you need additional information.
Good luck and kind regards.
Thank you for using FIXYA.

Sounds like it's faulty. is it under warranty?