2509m went dark

8 month old hp 2509m abruptly went dark. For the few seconds the screen can be seen, it is darker on top than on the bottom. If you look closely things can be seen on the screen but are very dark. What is odd that turning on and off the monitor seems to cause a normal display for a second or two before the light shuts off. When starting pc, screen comes on then shuts off. comes on again and shuts off. When turning on and off after start up the montior screen shows as normal then shuts off after a second. Hooking up monitor to another pc or laptop has same results. Unplug cable, message shows to check cable. If plugged in when PC powers down, will receive a monitor going to sleep message. Using Windows Vista and a vga cable. Have also replaced cable with a new one.
Any ideas?

Try a monitor reset. Power off PC and monitor. Unplug the monitor and then hold down the monitor's power button for 30-60 seconds. The plug everything back in and give it a go. There is also a factory reset function under the monitor's menu that you can try. If this doesn't fix the issue then contact HP support as the monitor has a 1 year warranty and ask for a replacement.
HP's support number is 800-474-6836 or 800-HPINVENT or online here.
HP DV9700, t9300, Nvidia 8600, 4GB, Crucial C300 128GB SSD
HP Photosmart Premium C309G, HP Photosmart 6520
HP Touchpad, HP Chromebook 11
Custom i7-4770k,Z-87, 8GB, Vertex 3 SSD, Samsung EVO SSD, Corsair HX650,GTX 760
Custom i7-4790k,Z-97, 16GB, Vertex 3 SSD, Plextor M.2 SSD, Samsung EVO SSD, Corsair HX650, GTX 660TI
Windows 7/8 UEFI/Legacy mode, MBR/GPT

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2509m went dark

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