Compaq FS740 Monitor Display Problem

[Geravania]

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, but I didn't even fool with the On-Screen Display). I tried to use the "Pincushion" setting on the OSD (along with every other option), but to no avail; none of the options seem to affect the monitor. Please help me resolve this issue, thank you very much.