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Sceeen just stays black "no signal"

waloshin

waloshin

macrumors 68040
Original poster
Oct 9, 2008
3,562
394
Screen stays black.
I've tried the onboard vga, onboard hdmi.
I also tried my GTX 460 through the hdmi and nothing works.
the fan spins on the video card even when not plugged into power.
Everything else turns on.
The keyboard light blink when I first turn on, but I cannot turn them back on.
 
For clarification:

My desktop computer is not sending out a video signal through either the hdmi or the vga.

Even my nvidia GTX 460 is not sending out a signal to the monitor.
 
I'm guessing it's a PC considering a Mac Pro doesn't have onboard VGA?
What are your BIOS settings for the Video Card? Is it set to use the integrated or dedicated at boot? Can you see the computer POST at all?
 
mgartner0622 said:
I'm guessing it's a PC considering a Mac Pro doesn't have onboard VGA?
What are your BIOS settings for the Video Card? Is it set to use the integrated or dedicated at boot? Can you see the computer POST at all?
Click to expand...

Nope can't see the post at all.
 
So it's a PC not a Mac?

waloshin said:
Screen stays black.
I've tried the onboard vga, onboard hdmi.
I also tried my GTX 460 through the hdmi and nothing works.
the fan spins on the video card even when not plugged into power.
Everything else turns on.
The keyboard light blink when I first turn on, but I cannot turn them back on.
Click to expand...

The fan spinning on the video card sans power means time to call a priest.
 
waloshin said:
Yep. Pc.
Click to expand...

Well I was a PC tech for almost 30yrs, today I try to avoid them.
Anyway what motherboard / brand is it?
Does the motherboard have built in video?
Does the monitor work? (can you plug your macbook in to test?)
Have you recently changed anything in hardware?
Details
 
blueroom said:
Well I was a PC tech for almost 30yrs, today I try to avoid them.
Anyway what motherboard / brand is it?
Does the motherboard have built in video?
Does the monitor work? (can you plug your macbook in to test?)
Have you recently changed anything in hardware?
Details
Click to expand...

Motherboard: asus m4a785-m
I just built this computer so I added ram: KVR1333D3N9/2G
I will check to see if the monitor works.
cpu: and phenom 2 x4 955BE
Video card: evga 1gb GTX 460
I've also tried the onboard video.
 
My last PC (now lives in the closet) was a ASUS M4A78EM with a AMD Phenom II X4 3 GHz. This combo hated the DRAM to be anything but stock speed (DDR2-800MHz).

ASUS is very fussy on RAM, is yours on the list for that motherboard?
http://ca.asus.com/en/Motherboards/AMD_AM2Plus/M4A785M/#MSL
Are you trying to over clock it? Have you reset the CMOS (a jumper)

Try using only one stick of DRAM to start, make sure it's in the correct slot (see the manual).

Don't even bother with the video card till you get past the POST screen and update the BIOS to whatever is current. (make sure the card is physically removed from the system)

Don't mess with over clocking till you have a stable setup.

How powerful is your power supply?
 
blueroom said:
My last PC (now lives in the closet) was a ASUS M4A78EM with a AMD Phenom II X4 3 GHz. This combo hated the DRAM to be anything but stock speed (DDR2-800MHz).

ASUS is very fussy on RAM, is yours on the list for that motherboard?
http://ca.asus.com/en/Motherboards/AMD_AM2Plus/M4A785M/#MSL
Are you trying to over clock it? Have you reset the CMOS (a jumper)

Try using only one stick of DRAM to start, make sure it's in the correct slot (see the manual).

Don't even bother with the video card till you get past the POST screen and update the BIOS to whatever is current. (make sure the card is physically removed from the system)

Don't mess with over clocking till you have a stable setup.

How powerful is your power supply?
Click to expand...

I have reset the cmos earlier didn't help, I've ran the computer without the ram didn't work.

Would pulling the battery for a bit maybe work?

Corsair tx 750w 750 watts.
 
Last edited:
It's got to have the RAM, won't do squat without it. Since it's brand new you might need to take a trip to wherever you bought it from.

Taking the battery out is no different that the jumper thing, won't hurt but will have the same result.

If the CPU fan isn't starting that's bad. Could be a bent pin or just about anything. Unfortunately taking off the heatsink to check means you have to reapply thermal grease.

Are all the power connectors connected (that motherboard has two sets) and seated properly?

Aside from actual busted electronics my first suspect would be the RAM is simply incompatible with that motherboard CPU combo.

*** Ahh your DRAM is DDR3 and that motherboard only takes DDR2, you've got the wrong RAM type ***

How did you get it to fit? DDR2 & 3 should be keyed differently.
 
Last edited:
blueroom said:
It's got to have the RAM, won't do squat without it. Since it's brand new you might need to take a trip to wherever you bought it from.

Taking the battery out is no different that the jumper thing, won't hurt but will have the same result.

If the CPU fan isn't starting that's bad. Could be a bent pin or just about anything. Unfortunately taking off the heatsink to check means you have to reapply thermal grease.

Are all the power connectors connected (that motherboard has two sets) and seated properly?

Aside from actual busted electronics my first suspect would be the RAM is simply incompatible with that motherboard CPU combo.

*** Ahh your DRAM is DDR3 and that motherboard only takes DDR2, you've got the wrong RAM type ***

How did you get it to fit? DDR2 & 3 should be keyed differently.
Click to expand...

Actually the motherboard is:

http://www.asus.com/Motherboards/AMD_AM3/M4A78LTM/

Asus m4a78lt-m

The cpu fan runs fine.

All the power connectors are connected fine.

The computer will not boot up if I have the 4X 12 volt plugged in,
The computer will only boot up if I have only the 24x 12 volt plugged in.

Example:

23jik3s.png


I think I will reset the cmos again; hopefully that will work.
 
I have reset the cmos took the battery out and still nothing.
 
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