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It is the right age for failure---IF you are able look inside at the power supply for bad caps---I will attach photos of what to look for.
The three tries is what is called a three strikes and you are out (no joke)----the unit has built into it (many do) a feature where it will try 3 times to make it up and on and if fails shuts down or stops trying.
if the power light indicator is just blinking with no display, you must checked the power supply the common cause bulging electrolytic capacitor. just replace with the same value and rating then the problem solved.
try to connect monitor with other computer, this way u will confirm weather the fault is in monitor or in computer. if it is in monitor, check for bent pins in connectors which connecting computer & monitor, firmly connect both ends of connecter & tighten the screws. if problem not solves then u need to replace main board of monitor.
First if you have a extra monitor try to plug it in and see if it works. If not then check your video card. or get into the computer and try and remove and reseat the memory. Sometimes by just doing that can solve the problems
Self-Test Feature Check (STFC)
Your monitor provides a self-test feature that allows you to check whether your monitor is functioning properly. If your monitor and computer are properly connected but the monitor screen remains dark, run the monitor self-test by performing the following steps:
Turn off both your computer and the monitor.
Unplug the video cable from the back of the computer. To ensure proper Self-Test operation, remove Analog (blue connector) cables from the back of computer.
Turn on the monitor.
The floating 'Dell - self-test Feature Check' dialog box should appear on-screen (against a black background) if the monitor cannot sense a video signal and is working correctly. While in self-test mode, the power LED remains green and the self-test pattern will scroll through the screen continually.
Turn off your monitor and reconnect the video cable; then turn on both your computer and the monitor.
If your monitor screen remains blank after you use the previous procedure, check your video controller and computer system; your monitor is functioning properly.