Sign in with
Sign up | Sign in
Your question

No VGA Signal?

Last response: in Graphics & Displays
Share
October 2, 2010 3:14:38 AM

well i recently built a new gaming computer and it worked fine for about 2 weeks but 2 days ago there were 2 power trips after the first powertrip i turned on my computer it worked fine but about 20 mins later a second power trip happened and i try to turn on my computer and i get no DVI signal error message, i tinkered with my monitor and video card trying different DVI connectors but with no luck... the power for my computer was on a power strip but my monitor was not so i tried the monitor on my brothers computer and it worked fine so i can safely assume the monitor is fine and im thinking its my video card but im not 100% sure :( 

running
asus crosshair formula 3 m/b
ati hd 5850 from xfx
xfx 650 W modular p/s

does this sound like a video card problem or does it sound like something worse?

More about : vga signal

a c 1363 U Graphics card
a c 100 C Monitor
October 2, 2010 3:19:21 AM

Can you test your card in your brothers PC? It can be the PSU or motherboard as well so process of elimination is the next step.
m
0
l
a b U Graphics card
a b C Monitor
October 2, 2010 3:39:36 AM

Two possibilities:
1. The system is booting, but displaying no video. Moving the video card to a working computer will tell you if the video card is good.

2. The system is not POSTing and only looks like it is booting. In this case, you have something more fundamentally wrong.

If the video card works in another computer, work through our standard checklist and troubleshooting thread:
http://www.tomshardware.com/forum/261145-31-read-postin...
I mean work through, not just read over it. We spent a lot of time on this. It should find most of the problems.

If not, continue.

I have tested the following beep patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different.

Breadboard - that will help isolate any kind of case problem you might have.
http://www.tomshardware.com/forum/262730-31-breadboardi...

Breadboard with just motherboard, CPU & HSF, case speaker, and PSU.

Make sure you plug the CPU power cable in. The system will not boot without it.

I always breadboard a new build. It takes only a few minutes, and you know you are putting good parts in the case.

You can turn on the PC by momentarily shorting the two pins that the case power switch goes to. You should hear a series of long, single beeps indicating memory problems. Silence indicates a problem with (in most likely order) the PSU, motherboard, or CPU. Remember, at this time, you do not have a graphics card installed so the load on your PSU will be reduced.

If no beeps:
Running fans and drives and motherboard LED's do not necessarily indicate a good PSU. In the absence of a single short beep, they also do not indicate that the system is booting.

At this point, you can sort of check the PSU. Try to borrow a known good PSU of around 550 - 600 watts. That will power just about any system with a single GPU. If you cannot do that, use a DMM to measure the voltages. Measure between the colored wires and either chassis ground or the black wires. Yellow wires should be 12 volts. Red wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.

The gray wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.

You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.
http://www.youtube.com/watch?v=5FWXgQSokF4&feature=yout...

This checks the PSU under no load conditions, so it is not completely reliable. But if it can not pass this, it is dead. Then repeat the checks with the PSU plugged into the computer to put a load on the PSU.

If the system beeps:
If it looks like the PSU is good, install a memory stick. Boot. Beep pattern should change to one long and several short beeps indicating a missing graphics card.

Silence or long single beeps indicate a problem with the memory.

Insert the video card and connect any necessary PCIe power connectors. Boot. At this point, the system should POST successfully (a single short beep). Notice that you do not need keyboard, mouse, monitor, or drives to successfully POST.

Now start connecting the rest of the devices starting with the monitor, then keyboard and mouse, then the rest of the devices, testing after each step. It's possible that you can pass the POST with a defective video card. The POST routines can only check the video interface. It cannot check the internal parts of the video card.
m
0
l
Related resources
October 2, 2010 4:53:04 AM

well i would test my video card except my brothers computer doesnt have any pci express, ill try the beeping tests and see if that tells me what is wrong
m
0
l
October 2, 2010 5:15:35 AM

okay i put the internal speaker on the mb and started the computer up but there was no beeping at all
m
0
l
October 4, 2010 6:12:57 AM

well i found the problem wich is good but also sucks at the same time

a stick of my OCZ AMD Black edition Ram died and was'nt posting right.. guess ill stick with G.skill/Corsair ram from now on :( 
m
0
l
!