Hi
I test my desktop computers with this

http://www.1powershop.com/en/computer-networking/post-4-pc-isa-pci-diagnostic-card-analyzer-test-probe.html

I have the same problem with my computer shows a black picture of the screen and the device made the mistake

http://img338.imageshack.us/img338/8619/pcanalyzer.jpg

cod: 13 Video display is disabled port-B is initialized. Chipset init about to begin.

This is motherboard in onboard video but i test in external it`s not work
http://www.asrock.com/mb/overview.asp?Model=P4VM800&s=478

Is there a way to solve this problem
Thank you

Computer is on but no image in the monitor

yes

In hindsight, maybe what is just needed here is to replace the monitor and buy a new one. Maybe it's really the monitor that has defects.

i have a pc that shows no picture on the monitor. Have tried different monitor but still no picture what can be the problem should i buy a new video card

take a look at this link and see if any of these dianostic light will help you to resolve your issue.

also when the monitor is connected to the PC if you turn it off then back on does the light come on green then go to orange? if so the monitor is not the problem.

http://support.dell.com/support/edocs/SYSTEMS/dim8400/SM/adtshoot.htm

yes the monitor light does go green then back to orange. it still has no picture no matter what i have changed the monitor to one i know works.

what about when you have a laptop

i am having the exact problem as pretty much everyone on this thread. everything seems fine gpu runs normally and the hdd seems to be working like normal on start up HOW EVER my keyboard and mouse are completely un-responsive the same as the monitor its like they arent even plugged in. i have tried 2 different monitors and 2 different keyboard and mouse's in every usb slot. this sounds like a motherboard problem does it not?

I am having the same problem. I have a Compaq with a Hp monitor. Up until this afternoon everything was working fine. Then the monitor went blank but I could still hear the game I was playing in the background, just not see it. I hook up the computer to another monitor and it stayed on. Then I decided to hook it up to my tv and it worked fine for a while then it went blank and said unsupported device. I cut off the computer and when I cut it back on it did a scan of my NTIF file (I think) it said nothing was missing or wrong, do you think the problem is fixed or do I need to just go out and buy another computer. Will setting it back to factory settings help me any?

i am having the same problem but my keyboard light will not come on all it do is blink when i start up the cpu.

I Have the Same problem....i have tried connecting the monitor to laptop and the problem is not fixed so the problem is not with cpu...the problem is either with vga cable or monitor itself...

Well I am having a similar problem. 2 weeks ago my power supply gave out. The night before the power supply gave out my computer worked great. The monitor and everything.
I've installed a new power supply, and now this blue light in the front of the tower doesn't come on and there's a black screen on my monitor.

I've also bought the adapter to convert an older model monitor to a newer one. I don't know what the issue is.

I want to thank you all for the input I found here. I, too, had the same problem. I went to restart my VAIO and suddenly there was nothing on the screen. Through your suggestions I simply took out each of the two RAM chips I had put in a few months earlier and reinserted them securely. That simple thing solved the problem. My next troubleshooting step would have been to plug in external monitor, but that proved to be unnecessary. Thanks again to everyone!

has anyone had this problem before ?

...hey guyz, TRY TO SWAP OR REPLACE A NEW MEMORY TO YOUR EXESTING MEMORY...or, TRY TO SWAP OR REPLACE A VGA or DVI CABLE..or, REPLACE YOUR EXISTING VIDEO CARD TO A NEW ONE..^_^..i hope it helps!..

I have the same problem but i know its not monitor or power supply and video card it has be ram or motherboard hell could be cpu. have not tested enough i dont have spare parts to test them. what ya get for makeing your computer badass nothing to test with ;(

As stated above, are you still getting the system beep when you power on?.. or perhaps 3 or 4 beeps after power on?.. if its more than 1 beep, i would definately try the ram theory, test each ram stick individually, ensuring to insert into first/DIMM 1 Slot, would be my first guess to this problem. - other possibility also, have you updated your video driver recently?.. try rollback to previous video driver?.. :)

Hello,
I have a windows Vits 16 bit and my monitor is not showing any display when i'm turning on the CPU. It just flash oncew then the monitor power LED starts blinking. Please help me how to get rid of this thing :/

Thanks,
Sagar

Hi have you had a look in the harddrive i thinks the mother board