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Pc turns on but screen stays black

Last response: in Graphics & Displays
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October 30, 2010 5:55:03 PM

Ok, i always had a GeForce 6500 and it worked fine.Today i went out and bought the Geforce GTS250 , but after installing it and turning my pc on nothing shows on my screen.Everythin goes on even the graphics card fan is spinning and i can hear the windows sound but my screen stays black.

Windows XP service pack 2
2gig ram
AMD Athlon 64X2 duel
Core Processor 5000+
2.60GHz
October 30, 2010 8:26:36 PM

Make sure you're display connections are okay from both you're monitor and graphics card, and also check if you're graphics card is seated properly on it's slot.

hope this helps!
October 31, 2010 5:24:46 AM

Nope, i checked.Do u think maybe it will help if i update the BIOS?
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a b U Graphics card
October 31, 2010 6:00:55 AM

What is your power supply? Did you connect the 2x PCIe 6 pin connectors?
October 31, 2010 8:49:26 AM

Got a 450watt, ye i did connect them
a b U Graphics card
October 31, 2010 10:47:51 AM

The first thing to do when an upgrade goes wrong is to back up to the original configuration.

Does the system work properly when you reinstall the original video card?

If yes, you have found your problem.

If no, something died during the upgrade process and you need to find it. 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 beeps 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. You do have a case speaker installed, right? If not, you really, really need one. If your case or motherboard didn't come with a system speaker, you can buy one here:
http://www.cwc-group.com/casp.html

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:
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.



October 31, 2010 3:11:31 PM

@jsc. You know I totally agree with you.
!