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there is a simple fix for this problem by enhancing the signal throught the vga cable attach a magnet to both ends just before the connection ive used tape in the past just make sure to wrap the magnet around the wire, best to try and use some of those bendable fridge magnets but make sure the magnets are not next to the screen as this will cause discolouration, hope this helps
check connections most likely culprit is a blown fuse on the screen mainboard very easy to replace but must be soldered unless you use a little bit of copper wire twisted and rolled up to cover both ends of the internal fuse then stick it down with insulation tape but do this at your own risk
By shutting down do you mean you get a signal then it goes to no signal, or does it just show no signal regardless of what PC it's on? It sounds like you have display and backlight to see the no signal message so I would guess that the board inside that takes incoming video and sends it to the display has gone bad, or a component gone bad. Anymore electronics get 2 to 4 yrs old and electrolytic capacitors swell or burst on top causing problems from totally dead to weird errors that seem like something else. It just comes out of the blue too, most time no advance warning. Without getting inside the monitor to check it's hard to tell but someone that does bench repair should catch it if there are swollen or leaking capacitors especially if you mention fr them to check for them. If not then it's possible the video display chip has gone bad and a new board is needed. Probably not available anywhere but a seller that parts out working off lease equipment such as on ebay. You've already done what you should by trying a new cable and trying on more than one machine.
I don't know what might have happened, but a number of years ago I had an apple monitor and the power light on it started blinking, so I got in touch with apple and they told me that it's flashing an error code, so they told me what the blinking indicated and fixed it.
So I think the blinking of the power light on your monitor could be indicating an error code so I suggest you call apple and they will identify what the error is indicating.
Mode not supported means the vertical sync for the video card is too high for the monitor.
As the computer boots right after the diagnostic beep start pressing the F8 key (sometimes simply pressing and holding it down doesn’t work so tap it a few times) you will receive a menu asking you which you want, select startup in safe mode. The computer will start with a minimum set of drivers. You will have just the basic access to your machine but that is all that is needed.
When in safe mode RIGHT click on the desktop and select properties> settings> ADVANCED>monitor. In the middle will be a field with a drop down menu. Select the 60 hertz option-your monitor should be able to handle that easily. Press the "apply" button you will get a question box asking you if you want to keep the new setting, UNLESS you received an error, or the monitor had fits-select yes here, remember you have only 15 seconds to confirm this new setting. Select ok to close the box, select ok to close the properties box, shutdown your computer. When you start it up again, you should not receive the error message.