Compaq FS740 Monitor Problem.

I've just recently been afflicted with a problem concerning the Compaq
FS740 model. I'm as surprised as can be when it happened, as I have
no idea how it occurred. I was browsing the internet when the screen
just suddenly changed the magnitude of its concavity (the screen took
on a concave shape for no reason). I tried to use the "Pincushion"
setting on the On-Screen Display, but to no avail; in fact, none of
the options on the OSD seem to affect the monitor. Please help me
resolve this issue, thank you very much.

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