Replaced motherboard, no signal on monitor

Test all leads that attach to your hard drive including electrical extensions,IDE,SATA

the leads from your ((motherboard to your hard drive)) make sure they have a secure connection and are not faulty or just replace them they might be faulty make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty even the electical extensions

even something as small as an electrical fan and its lead can cause this problem or just replace them they could be faulty a computer needs all electrical power and data to continue through every working device and to have an end so any faulty leads will end up with a computer error

make sure your graphics card is securely seated with no dust built up or in the socket

hope this helps you

That means that the monitor is not getting a signal from the computer. There are several possible issues involved. 1) Make sure that the computer tower is on. 2) Check that the video cable is connected to the active port on the desktop. (Computers often have video connections on the motherboard and an added video card. The motherboard connection is disabled when the video card is active. Similarly if there are several ports (VGA, DVI, HDMI, Display port) only one may be active.) 3) Try a new video cable (if possible) and one of the other video ports (again if possible). 4) Try connecting a different monitor to the computer or connecting this monitor to another computer.

Open up the computer and check if the card requires a separate power connection to the power supply. Make sure it is plugged in. Do the fans in the computer spin up?

If a second monitor doesn't work or the monitor works on another computer, then the problem is with the video adapter on the computer, the power supply or the power switch. Please add a comment with more information about the type of desktop and the current video graphics adapter (on the motherboard or separate card). I will provide additional help if possible.

Cindy Wells
(who has a computer in the company that needed a new monitor (power supply failed) a few months ago and lost the fan on the video card last week. Without the fan, the card overheated and shut down. Thus no signal to the monitor.)

motherboard to hard drive leads

Test all leads that attach to your hard drive including electrical extensions,IDE,SATA

the leads from your ((motherboard to your hard drive)) make sure they have a secure connection and are not faulty or just replace them they could be faulty
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty or just replace them they could be faulty ?
one bad lead will end with a computer error a computer needs its connections continue its cycle and have an end to function properly

even something as small as an electrical extension or a faulty fan lead can cause this problem computer needs all of the data and electrical current to travel through every device and to have an end to be able work properly

a motherboard and a hard drive any leads between them will fail before your motherboard or your hard drive if its a flat ribbon 40 pin type IDE replace it this will be the first to fail check all electrical extensions make sure they are securely seated even the cd/dvd floppy drives need to have current go through make sure these drives are working

hope this helps

Test your PSU or replace it if your power supply units fan is not working your PSU is faulty

One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect/ boot up a computer hard drive

Test all leads that attach to your hard drive including electrical extensions,IDE,SATA

the leads from your ((motherboard to your hard drive)) make sure they have a secure connection and are not faulty or just replace them they could be faulty
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty even the electrical extensions or just replace them they could be faulty a computer needs its connections to continue its cycle and have an end so any faulty leads will end up with a computer error hope this helps

One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect your hard drive

Test all leads that attach to your hard drive including electrical extensions,IDE,SATA

the leads from your ((motherboard to your hard drive)) make sure they have a secure connection and are not faulty or just replace them there probably old and faulty
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty even the electic extensions or just replace them they are probably faulty a computer needs its connections to have an end so any faulty leads will end up with a computer error hope this helps
don

Most monitors will behave that way if they don't get a signal from the computer so there's nothing to display. A quick check of the monitor itself is to disconnect the signal cable from the computer and then turn the monitor on. Most monitors will display some kind of a message that there's no input and to check your cable connection. Then the power indicator changes color as the monitor blanks out.

You will probably find that your computer isn't starting up when you turn on the power. A common computer problem is that it will turn on when you press the power button, showing a power light and you'll hear the fans inside start running, but it never actually starts running. Then there's no video to the monitor and you see the trouble you described.

The monitor may still be bad. If everything seems to be starting normally and you hear the Windows startup sound through your speakers, but the display stays blank, try another monitor. If that one works, you'll need to have the bad one serviced or replace it. If the test monitor is also blank, the video circuitry in your computer has failed. If the video is built into the motherboard, you can install a plug-in video card as a replacement.

If the computer is turning on but never starts running, that can be a pain to figure out because several things can cause the trouble. The most frequent causes are a bad power supply or motherboard. Bad RAM or a defective drive or other device connected to the motherboard can also keep the board from starting up. The processor itself can fail, but that's not common. I start by removing everything except for the power supply, processor and fan to see if the motherboard is starting. If the motherboard doesn't give a "no memory" error (usually a long beep), you need a power supply or motherboard. Otherwise, the basic hardware is fine, and you can start replacing parts until the trouble comes back, and then you'll know what caused it.

Good luck, and thanks for using Fixya!

Did you forget to connect the 4 pin power plug to the display card or motherboard??????????

"I have checked ram and every thing else" (sic) When you say everything else, I presume you mean with No HD, No DVD, NO "Other" cards in slots, No USB, & just a monitor connected? If yes to all those, then yes I would think that the MB has developed a Fault. The "Red Light" this LED usually signals that the MB is receiving good power, it is NOT a "Fault Light". have you REPLACED the RAM with new ones? You say "Alarm" what exactly is this alarm sound?

No signal on screen means that there is no input for your monitor from the PC.

1. There might be problem in your PC or in the cable connected to PC from monitor.
2. Your PC might damage that it could not send signal to the monitor.
2.1 In your Motherboard might be faulty in the VGA chips.
2.2 In your Motherboard's SMPS mean power supply.

I think you can got my point. If you are tech person it will help you, otherwise you should take a tour to any service centre.

Thanks & Goodluck
Iqbal

I've seen situations similar to yours several times and they've always been a bad CPU.  Since you tried a new video card it's not that, I would suggest a new CPU.  Check on ebay, you can usually find used one's on there.