HTPC to amp to projector - no image unless PC turned on last

Home Cinema Hero

Established Member
Hi all,

I've got an HTPC hooked up to my amp (DVI to HDMI) and then to my projector (HDMI to DVI).

Often, I want to turn on the PC without the projector being on - say I'm transferring files over to it across the network - but I then have a problem if I want to turn the projector on at a later point - the image won't display, even if I shake the mouse and hammer the keyboard.

It seems that the amp (a Sony STR-DG910) needs to be on and set to HTPC and the projector (a Screenplay 7210) needs to be on before I boot the PC (with a Gigabyte 'Silentpipe II' Fanless NVidia GeForce 8600GT 256MB Dual DVI GFX card), or I get no display. The only solution is to restart with the amp and projector on.

Any ideas why this might be the case, or what I could perhaps do to force the PC to send an image, or perhaps refresh its output - I wonder, for example, if changing the resolution and then back again would get the amp/projector to notice a new/changed signal...

Home Cinema Hero

Established Member
I think there might well be - the problem is that I can't see the screen to use it. I suppose I either need some kind of automated script I could launch with my remote (clutching at straws I suspect) or to work out which piece of the puzzle is at fault and, perhaps, upgrade it.

Cafe Racer

Established Member
Ahhhh, I just assumed that you could see something on another monitor when you said you were transferring stuff over the network. I guess you mean that you turn the PC, copy stuff over to it but from another PC.

Yeah, I think that's what I'd do - try and configure a button on the remote. Which remote do you have? I read a threat the other day where a guy uses autohotkey to change resolutions via girder and his remote:

Personally, I'd recommend IRSS rather than Girder.


Distinguished Member
does the same thing happen if you take the amp out of the equation, i.e. if you go straight from pc to projector?


Established Member
There's a free application called hdmion.exe that can help with this sort of issue.

It stops/restarts the display in order to resend the EDID handshake.


Standard Member
I've only just come across this thread and hopefully this will help someone
as I had a similar problem.
It turned out to be a bug in the motherboard BIOS that didn't re-display the HDMI output unless the projector was on before the PC. It also happened if I switched to any other output via my 4 way video \ audio switcher.
The PC's HDMI signal never reconnected to my Infocus 7200 and the screen would just stay black until I rebooted the PC.

In the end the solution was simple. Download the latest BIOS firmware from the manufacturers website and flash your BIOS to the latest firmware.

My motherboard was a Gigabyte GA-MA78GM-S2H 780G Socket AM2+ with on board VGA 8 channel audio.

Hope this is of help to somebody :thumbsup:

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