No connection to monitor

PeePauw · 03-09-2009, 03:52 PM

I have a really terrible computer at home and stumbled upon a friends computer, which doesn't work but would be an amazing upgrade if i could make it to. His problem was that the monitor wouldn't connect to the PC. I looked at it, reconnected everything as best as i could, and started it up. Everything seems to be working fine, all the fans start running, and the green light on the motherboard lights up, but still there is no connection to the monitor. The motherboard is an Asus P5NSLI, and the graphics card running out of it is a radeon 1950 pro. I've read about other people with the same problem, the difference though is that they all say their graphics card doesn't start up, while mine does as the fan runs fine. Any help i could get would be much appreciated.

**emosun** · 03-10-2009, 08:49 AM

It could be any number of problems. When a machine doesn't post it can be bad memory , bad cpu , bad video card , bad or in correctly connected drives , ect.

First just try a bios reset and see if it does anything (remove power and clock battery for 5 minutes). If that doesn't do anything try bench testing the machine.

dai · 03-10-2009, 09:31 AM

cmos reset
turn the computer off
remove the power lead from the back
take the side off
remove the cmos battery
move the cmos jumper from pins 1 and 2 to pin 2 and 3 and the back to pins 1 and 2
reinsert the battery
put the side on
replug in the power lead
boot the computer

there can be 2 solder points you touch with a screwdriver
2 pins you touch with a screwdriver or use a jumper
a cmos clear switch or button
there will be a diagram and instructions in your manual

what brand and wattage power supply is in it

PeePauw · 03-12-2009, 06:05 PM

Tried the cmos reset, to no avail. The power supply is antec, and it says it has 500 w maximum. There's also no beep when the computer starts, not sure if that's cause for concern.

dai · 03-13-2009, 02:27 AM

remove the ram and see if you receive the bios error when you try to boot up

PeePauw · 03-13-2009, 12:47 PM

Took out the ram, still no monitor. However, upon reinserting the ram and starting it up again the monitor came up miraculously. It says that it has a Cmos checksum error now.

...and then when i tried to start it again, once more no monitor. I realized that the cable connecting the hard drive had fallen loose and shut the machine down to re connect it, but when i tried to bring the boot screen back up it failed.

dai · 03-13-2009, 10:51 PM

Cmos checksum error is usually not enough power
see if you can borrow another 550w psu to try in it

03-09-2009, 03:52 PM	#1 (permalink)
PeePauw Registered User Join Date: Mar 2009 Posts: 3 OS: xp	No connection to monitor I have a really terrible computer at home and stumbled upon a friends computer, which doesn't work but would be an amazing upgrade if i could make it to. His problem was that the monitor wouldn't connect to the PC. I looked at it, reconnected everything as best as i could, and started it up. Everything seems to be working fine, all the fans start running, and the green light on the motherboard lights up, but still there is no connection to the monitor. The motherboard is an Asus P5NSLI, and the graphics card running out of it is a radeon 1950 pro. I've read about other people with the same problem, the difference though is that they all say their graphics card doesn't start up, while mine does as the fan runs fine. Any help i could get would be much appreciated.

03-10-2009, 08:49 AM	#2 (permalink)
emosun Moderator Hardware Team Join Date: Oct 2006 Location: usa Posts: 6,982 OS: xp pro sp2 My System	Re: No connection to monitor It could be any number of problems. When a machine doesn't post it can be bad memory , bad cpu , bad video card , bad or in correctly connected drives , ect. First just try a bios reset and see if it does anything (remove power and clock battery for 5 minutes). If that doesn't do anything try bench testing the machine. __________________ Gpu Benchmarks Cpu-Z Power supply information and selection Gpu-Z Video card quick list

03-10-2009, 09:31 AM	#3 (permalink)
dai Manager, Hardware Forums Join Date: Jul 2004 Location: west australia Posts: 56,630 OS: win 7 32x 64x rtm	Re: No connection to monitor cmos reset turn the computer off remove the power lead from the back take the side off remove the cmos battery move the cmos jumper from pins 1 and 2 to pin 2 and 3 and the back to pins 1 and 2 reinsert the battery put the side on replug in the power lead boot the computer there can be 2 solder points you touch with a screwdriver 2 pins you touch with a screwdriver or use a jumper a cmos clear switch or button there will be a diagram and instructions in your manual what brand and wattage power supply is in it __________________

03-12-2009, 06:05 PM	#4 (permalink)
PeePauw Registered User Join Date: Mar 2009 Posts: 3 OS: xp	Re: No connection to monitor Tried the cmos reset, to no avail. The power supply is antec, and it says it has 500 w maximum. There's also no beep when the computer starts, not sure if that's cause for concern.

03-13-2009, 02:27 AM	#5 (permalink)
dai Manager, Hardware Forums Join Date: Jul 2004 Location: west australia Posts: 56,630 OS: win 7 32x 64x rtm	Re: No connection to monitor remove the ram and see if you receive the bios error when you try to boot up __________________

03-13-2009, 12:47 PM	#6 (permalink)
PeePauw Registered User Join Date: Mar 2009 Posts: 3 OS: xp	Took out the ram, still no monitor. However, upon reinserting the ram and starting it up again the monitor came up miraculously. It says that it has a Cmos checksum error now. ...and then when i tried to start it again, once more no monitor. I realized that the cable connecting the hard drive had fallen loose and shut the machine down to re connect it, but when i tried to bring the boot screen back up it failed. Last edited by dai; 03-13-2009 at 10:49 PM.

03-13-2009, 10:51 PM	#7 (permalink)
dai Manager, Hardware Forums Join Date: Jul 2004 Location: west australia Posts: 56,630 OS: win 7 32x 64x rtm	Re: No connection to monitor Cmos checksum error is usually not enough power see if you can borrow another 550w psu to try in it __________________