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Message: <blockquote data-quote="wavefury" data-source="post: 2526222" data-attributes="member: 862500">I just bought an Aopen brand monitor, model f2915. It was working on the computer the guy i bought it from was using, and I saw it working. I tried hooking it up to my desktop, pressed the power button and it said "no signal" before going to standby mode. buttons are non responsive. I can only turn it off and back on with the same result. I hooked it up to my laptop; however, and it worked fine.  I just ran a clean install of my operating system, I connected another monitor to my graphics card and it worked fine.tried using the onboard video port, worked fine for the second monitor, the aopen still said no signal. i don't know what the problem is. any help is appreciated.the graphics card is a nVidia 8400 GS PCI card, the monitor is an Aopen f2915-8s LCD monitor, and my motherboard is a Dell f4491.</blockquote>