Why wont my moniter turn on?

My moniter wont turn on?

• when I turn my moniter on, the light turns green for a few seconds than turns orange. I have tried to use another moniter but the same thing happens. I think it's something wrong with the computer itself. whenever I turn the computer on, it always makes this beeping sound but it's not making it now when I turn it on. the light on the keyboard isn't turning on either. Do you have any ideas what I can do? I have already checked to see if it is the keyboard or the mouse and all the outer components and it still is the same. Could it be the video card? please help

• Answer:

  Assuming that if you're getting nothing at all from the computer (no lights, no fan, etc), you have already checked the electrical power source (outlet) and the power supply in the computer... so... If you have tried multiple monitors with the same result, the video card is the most likely cause. If it is in a PCI or AGP slot, turn everything off, pull the card out, clean the contacts with alcohol or electrical contact cleaner, and re-insert the card. That has resolved my video card troubles 9 times out of 10. Every once in a while, it actually turns out to be hardware that has failed so I hope that's not what you find. If it seems like that's the case, pick up a really cheap video card and throw it in the machine to prove that something else isn't causing the issue. Putting another video card in will also help determine whether the video card hardware failure is preventing the computer from getting past the hardware check when it first starts up. Even if you tried more than one monitor, be sure it isn't the cable. I have a monitor connected by a DVI cable that occasionally decides to ignore the computer telling it to power on. I still haven't discovered why it does that, but turning the computer off, unplugging the DVI cable, letting it stay unplugged for a few minutes, and then plugging everything back up seems to help. I suspect there must be some resistance built up on the contacts or maybe the monitor's power state firmware gets confused by a sequence of on/off cycles in the wrong succession. Whatever the case, also try disconnecting everything, including the power to the monitor and both ends of the video cable, give it a few minutes, plug it all back up, and try again. This is less likely if you have already tried a different monitor, but be sure you haven't switched the monitor to a different input accidentally. When the input is switched from the DVI input to something else (VGA/HDMI/etc.) the computer may not make it come on. Good luck.