When I turn on computer, it work normaly (only by sound) but on the monitor isn't send any signal. State of the condition leds of rear side of the motherboard is left-up red, right-up green, left-down and right-down red. What that mean???????
I mentioned this for someone else with this mb. you can only use a 1.5v (V= Volt) agp video card, older agp video cards are 3.3v (anything new today or in the last 5-6 years is 1.5v) a 3.3v agp video card will permenently damage this motherboard! and some are incorrectly "keyed" for the slot (the last remaining run before the 1.5v turnover)
Funny thing is they recently introduced "universal agp" 3 "keyed" agp video cards. these can be confusing as well because some do have 1.5v and 3.3v capabilitys while others that still have the 3.3v "key" do not, nor will they draw 3.3 volts even if placed in an older 3.3v only slot, just 1.5 volts.
This is a finicky situation, and this motherboard along with many others in its class can leave you with more questions than awnsers in the end the more you seem go searching for them.
I hope you didnt damage your motherboard with the wrong agp card. and maybe this will help others in the future with the same dilemma.
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Does it say no signal? Does is beep correctly during POST(power on self test)? Usually the remedy for this is checking your vga data cable if its connected properly and if it is, check the pins, are they all looking fine? If not change the cable and try again. If the cable is attached to your screen permanently, try a different screen.
I would still lean toward the computer being the issue. A lot of newer monitors will pop up something like "no signal" for 2-3 seconds and then enter power saving mode by default. If your getting at least this for a few seconds I would say the computer isn't working. Please note a computer can still have fans and lights going and still be bad. If you have lights and/or fans going I would start by replacing the power supply on the computer.
The easiest thing to do to narrow a problem down is rule out as much as you can. For the monitor if you have another computer, laptop or a friends laptop hook up the monitor to it and test. Monitor works then you have narrowed your issue to your computer. If the monitor still isn't working (you need to toggle the display generally on laptops [fn + F7] usually) then you know its the monitor.
By the way Samsung generally has a 5 year warranty on monitors.
If you have ruled out the monitor and power supply I would then try the following
If you have a dedicated graphics card, remove it and plug monitor into on-board video. If it works you know its the graphics card if it doesn't then it's most likely your motherboard.
Also can try completely unplugging the computer (pull power cord for 30 seconds) computers don't really turn all they way off usually they sit in S5 power mode)
Can also try pulling (if you have more than 1 stick of ram) pull all but one out and try powering on, repeat for each stick until it works. I have seen bad memory prevent computers from booting
Initially check the monitor whether it is working good you can check it by removing the monitor cable from the system when you remove cable you will able to see question mark in case of crt monitor this ensures your monitor is working good. when you power the system whether processor works if the processor works means you can conclude that the problem is with the ram or the video parts of mother board. Clear the dust in the ram slot and reinsert the ram
Then remove the cmos battery of the system and reset the bios settings.
Check whether the power cables are correct.
then power on the system if you receive display the problem is solved.
If the display does not appear check by replacing the new ram then giving motherboard to service centre
For the purpose of monitoring it, try bandwidth meter, it places an icon(which acts as the meter) and also gives the result in figures when asked to.......sodeep. PS: you can download it from cnet or softpedia
no most popularly its because u have filled up the ram slots some pc need to have the driveres installed to take the ram try taking all the ram out apart from one stick in slot one the turn the monitor/tv on and then the pc this should work if i dosent then the pc is booting in too high or too low a resilution normaly too low try using a old moniter jst to set the pc up but try the ram first normally works