The desktop won't reboot. The power light stays yellow. I hear a fan running, but the monitor says no signal.

sound to me like a video problem. no beep codes, you hear the fan going so it must be posting. could you try with other monitor and or cable? is there power to monitor? reseat cable at both ends( monitor+ pc)

Monitor is connected (power and signal), turned on?

It sounds like either your monitor or video card inside the computer is bad.

If the monitor is showing the "No Input Signal" message then the video card inside the computer is bad. The monitor is ok otherwise it would not be able to display the No Input Signal message.

When you plug in the power cord is there any lights whatsoever on the laptop, where the plug goes in or on the AC Adapter of the power cord?

When you press the power button do you hear fans running, hard drive spinning, lights on the computer, hear any beeps or lights constantly blinking, hear the DvD/CD drive click and the light on the drawer of the DvD/CD turn on for a second or two? If so the computer is trying to boot or may have booted, but the screen is not showing for some reason.

Beep tones and blinking lights tells the technicians what is going on with the laptop and why it is not booting. Most times it's a motherboard issue when you hear beeps or blinking lights continuous. Most times the problem is with the memory or Video Card. Count the Blinking Lights or Beeps and take note of their pattern (1 Long or 1 Long followed by 2 Short).

Maybe you have a Static Charge Buildup. Remove the Power Cord, then Press and Hold the power button for 30 seconds. After 30 seconds plug the power cord back in and hit the power button to see if it boots.

Maybe your memory is bad or the memory slot is bad.

Remove the Power Cord, Open the Case and remove one of the memory chips. Set the chip aside then try rebooting the computer. If it boots, then you know the memory chip you set aside is bad so mark an x on it with an ink pen. If it fails to boot then move the chip to the next memory slot and try rebooting. If it fails take the chip out and set it aside, then put the other chip in and try booting it in both slots. If it boots, just to verify that the chip set aside is bad, mark an x on it and put it into the open memory chip slot and try booting.

Try these steps if your computer won't turn on:

*You may or may not see a light on the back of your PC depending on the kind of power supply you have and the exact cause of the problem.(monitor light will likely be amber/yellow if your computer has stopped sending information to it)

*The power lights will stay on, you'll likely hear the fans inside your PC running, and you may or may not hear one or more beeps coming from the computer. If you hear beep sound, check your physical connections to the PC like RAM, Monitor, Cpu, Keyboard.

its not problem of fan. re-insert your ram. even if doesnt come then problem with ur motherboard chipset. if in blore call 9972888885

Hey Tony,
If you haven't already: pull all pci cards:
If you pull the ram, and you get no beeps at post, it's likely the main board. Does the pc beep at all? with or without ram? If not, likely the main board. Sorry. Hope this helps...

For reasons yet to be determined, your computer is not talking to your monitor.

This could be the monitor cable came loose from the tower (this is our favorite, because it is such an easy repair), or something on the motherboard (that is, anything) that is not functioning and preventing your computer from starting.

Unplug the connecting cable, and plug it back in again, making sure that it is seated properly.

Do you hear any sounds besides the fans? You should be able to hear the faint clicking of a hard drive starting up also. If you hear this, the problem is not in the computer, but in the communication to the monitor.

Good luck
tony

The monitor has the problem. the message only means, the connector is not properly connected on motherboared . please try another monitor.

I am sure about this...monitor or the connector ( as u have changed the motherboard) of the monitor has the problem.

I found some solutions other posted that didn't come up the first time I looked. I did a reboot and I'm good to go!

Try using another monitor that you know works. Then try another video card. The fans are running because the computer is running ---but the monitor is not. Green to Amber means monitor is not on.
A lot can go wrong with loose wires that shouldn't be loose.
But I would try this first.