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Screen won't turn on in my newly built computer

Last response: in Graphics & Displays
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March 28, 2011 5:23:59 AM

Hi guys, the screen won't turn on in my newly built computer, I have a i5-2500k, and everything is new and works compatible with each other except the graphics card, and it was given to me by my friend who helped me built it. It has no OS or anything, but turns on and everything runs fine even the graphics card turn on and it's fan runs, it's a HD 3879 Sapphire with a aftermarket cooler, it is kind of old and my friend said he burnt it already, so anyone think that might be the only problem? Because my screen turns on and everything runs fine. My specs are,
Intel i5-2500k
MSI P67A-C43 Motherboard
Seagate Barracuda 1TB SATA/HD
Intel X25-V SATA SSD
Logisys SOHO +2 w/ 480W PSU
DVD/CD Writer cheap but running as well
No OS or anything installed because I just put it together
And there is no beep when it is starting up, I don't know if that helps but at some of the other forums I looked at they mentioned it, so I was just putting it out there, just in case this post is not specific enough.
If anyone has any questions leave it here or PM me
a b U Graphics card
March 28, 2011 8:34:36 AM

Could you be more specific...
Your monitor won't turn on ? Did you see if there was any problem with the wires that connects to your CPU and the Monitor ?
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March 28, 2011 10:28:41 AM

This could be a number of things.

First, check your motherboard user guide under "System Panel Connector" and see if you connected the case 'case warning speaker' to the motherboard. If not (not all cases have this warning speaker) then you wont hear the startup beep, obviously.

Second, if you can get your hands on another video card that you know works try to boot up with that one in instead of the one you have now to rule out a bad video card.

Third, make sure you have all power connectors in place. (the 20 + 4 ATX connector, 4 or 8 pin 12v rail, and the 1x or 2x 6-pin pci-e power connectors if your video card has the power inputs for it.
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a b U Graphics card
March 28, 2011 1:05:26 PM

Work systematically 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.
The following is an expansion of my troubleshooting tips in the breadboarding link in the "Cannot boot" thread.

I have tested the following beep patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different, but they all use a single short beep for a successful POST.

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 once you are finished.

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...

A way that might be easier is to use the main power plug. Working from the back of the plug where the wires come out, use a bare paperclip to short between the green wire and one of the neighboring black wires. That will do the same thing with an installed PSU. It is also an easy way to bypass a questionable case power switch.

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, long single beeps, or series of short beeps indicate a problem with the memory. If you get short beeps verify that the memory is in the appropriate motherboard slots.

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.
At this point, if the system doesn't work, it's either the video card or an inadequate PSU. Or rarely - the motherboard's PCIe interface.

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.
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a b U Graphics card
March 28, 2011 1:08:23 PM

If the card has been burnt, what makes you think it will work?

Buy a new card.
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March 28, 2011 4:02:36 PM

I did everything on that list and there is no sound but there is a LED phase indicator, and it's always at 1, so I guess it's not even close to booting to BIOS, and my guess is the PSU because it came stock with the cheap case for 70, a 480W, so I'm gonna go return it now and get a case with another PSU, cause the 1 phase seems to be not getting enough power, the manual states 3 or 4 state, so I assume it might be what's wrong, hopefully someone answer me within the next 30 mins with something else in mind, or I'm heading to return the case w/ PSU and getting 2 diff ones that will definitely work
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March 28, 2011 7:42:45 PM

I'm going to test the graphics card in my friends computer, if it works, then it must be the motherboard as MSI said, they also said it won't be the case/psu because of 480W should be more than enough to power the little tiny graphics card like that, so by tonight hopefully I will have an answer as to whether it's the motherboard or the graphics card, thanks for the help everybody
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