no display

7i6gv / 775i65gv
March 10, 2009 at 08:02:49
Specs: Microsoft Windows XP Home Edition, 2.999 GHz / 502 MB
how to be sure if a motherboard is faulty i dont get any display even if i use a vga card i dont get any display

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March 10, 2009 at 11:16:36
No display is usually merely a symptom, and there's usually nothing wrong with your video adapter, your monitor, or your mboard - it's usually something else that is wrong.

It's easy enough to try your monitor with another computer, but usually there's nothing wrong with it.

You have not said
- whether the computer is booting properly otherwise
- whether this computer worked fine before
- what you last did or installed before this happened
- whether you had a power failure event or not.
Did you just attempt to flash the mboard's bios?
Did you just change which ram you have installed?

Supply all the detail you can.

If it isn't booting properly....

Failing power supplies are common and can cause your symptoms.
Check your PS.
They often partially work, fans and hard drives may spin, leds may come on, yet you get no video and the mboard will not boot all the way.
See response 4 in this:

If you have an el-cheapo PS, or a case that came with an el-cheapo PS, the PS is a lot more likely to fail than a better more expensive one that has the same or similar wattage capacity, and while it's failing it's a lot more likely to damage something else, e.g. often the mboard.

What's the make and capacity of the PS?

Apparently you have a Asrock 775i65gv desktop mboard, with an AGP slot and PCI slots.

Your mboard has onboard video, but if you are using a graphics card, in the AGP and/or a PCI slot(s), the PS must meet or exceed the minumum required system PS capacity, and if stated, that AND the minimum required current at 12v.
Go to the web site of the maker of the video card, and look at the specs for the model - it will probably say in the specs somewhere what the PS minimums are - often that's under system requirements - if you can't find that any card with the same video chipset has very similar PS requirements.

A monitor connected to the onboard video port when there is a video card installed in a slot will probably produce no display - usually the onboard video is automatically disabled in that situation.

If you have NOT changed the ram, or in any case....
A common thing that can happen with ram, even ram that worked fine previously, is the ram has, or has developed, a poor connection in it's slot(s).
This usually happens a long time after the ram was installed, but it can happen with new ram, or after moving the computer case from one place to another, and I've had even new modules that needed to have their contacts cleaned.

See response 2 in this - try cleaning the contacts on the ram modules, and making sure the modules are properly seated:
Did you just change which ram you have installed?
If you DID, it may not be compatible with the mboard's chipset, and in the worst cases the mboard will not boot when that ram is installed.
If you still have the ram that was in it before, try installing just that ram.

If you don't......
Make sure you have a speaker or speakers or the equivalent connected to the mboard so you can hear mboard beeps (see your mboard manual if you need to).
Remove the AC power to the case/power supply.
Remove all the ram.
Restore AC power.
Try to boot.
If nothing else is wrong, you will get no video but you will hear a pattern of beeps that indicate no ram is installed, or a ram problem.
E.g. for an Award bios or a bios based on one, that's often a beep of about a half second, silence for a half second, a beep of about a half second, silence for a half second, continuously.

If your PS is fine, you haven't changed ram or fiddled with it, in rare cases you may have this problem.

Open up your case and examine the mboard to see if you have bad capacitors, and/or other findable signs of mboard damage .

This was the original bad capacitor problem - has some example pictures.
History of why the exploding capacitors and which mboard makers were affected:

What to look for, mboard symptoms, example pictures:
Home page that site
- what the problem is caused by
- he says there are STILL bad capacitors on more recent mboards.

Pictures of blown capacitors, other components, power supplies, Athlon cpu's, etc.:

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