No picture on Desktop display help

im using a LG w2254tq monitor on a gateway laptoop with an ati 4300recently, my desktop (gateway) went into power saving mode during an idle as per normal, and could not recover. I rebooted and received no picture on my monitor, only a 'digital power saving mode' message to which is native to the monitor, not my desktop. It would appear my monitor didn't blow.I attempted to replace the digital cable with the analog one from my monitor to my ati 4300 to its respective vga connection. power on, no luck. i then removed my ati card and plugged the analog cable into my onboard video, power on, no luck.i decided to replace the mother board to a intel dg41rq, as i figured the mobo was the culprit. i repeated all the attempts noted above with my old motherboard, all the same results, no picture.i then became more suspect of the monitor as the problem, and plugged it into my laptop via analog cable, and voila a picture of my laptop screen was presented on the monitor.I then again tried to plug the analog cable into my atri card and brand new mobo's analog vga connection once more, and only a 'digital power saving mode' native to the monitor displays as before. I get no flickers, or screen shade changing or anything to suggest the monitor is attempting to present a picture from the desktop.i also reset the CMOS and removed the bios jumper to enter recovery, but still no avail.

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