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Power downthe computer. Check the VGA cable running from the computer to the monitor. If the cable is not snugly seated in both ports, the video signal will not reach the monitor.
Check the connector on each end of the VGA cable. Examine the nine pins on each connector. If any of the pins are bent or broken, the video signal will not reach the monitor. If there are just a few bent pins, you maybe able to straighten them with a pair of needle-nose pliers. Be careful not to break off any of the pins. If any of the pins are broke nor missing, you will need to replace the VGA cable with a new one.
Disconnect all cables and peripherals from the computer. Open the computer case by removing the Phillips screws along the side or back of the case. Remove the cover or side panel to expose the internal components. Locate the VGA card and make sure it is fully inserted into the PCI card slot. If the card is not installed correctly, the video signal will not reach the monitor.
Close the case, reconnect the power cord and all cables, and power up the computer. The video signal should display on your monitor.
May be a bad pin (bent over or missing) on your monitor cable to the video jack on your computer. If a bent pin, you can straighten it with small needle nose pliers; VERY SLOWLY--fast moves can fracture the pin and break it. If a pin is missing (broken off), the connector must be replaced. If connector looks good, and is not a molded, but a soldered type, a broken solder joint can be repaired, If it is a molded cable, the entire cable must be replaced. I focused on the cable because this is the most common cause of "no signal", and further troubleshooting would be 'involved', to say the least.
-check the monitor cable (vga cable the one with blue connector) for broken pins
-if there are broken pins replace the cable
-if not try another monitor cable or try the monitor to another cable
-if the monitor still turns to yellow after trying another cable or connecting it to another computer to problem could be with the monitor or the vga card
assuming you have a VGA monitor, disconnect the video cable and inspect the pins. Check to make sure that the pins are not bent/crushed or missing (there should be 15 pins in 3 rows). You may need to look at both sides of the cable. If they are crushed/bent, replace the cable if possible. If not possible (because your cable is hard wired to the monitor), try VERY GENTLY to straighten the pins
Your monitor uses a HD-15 type cable. There should be 3 staggered rows of (5) pins each. (Some cables are missing the 4th pin in the second row, this is normal). If you used enough force, it's possible that a pin was bent or even broken. I suggest looking at the connector (if not both) and make sure all the pins are intact and perfectly straight! If pins are badly bent or missing you should replace the cable. Next, check to see that all the monitor and power cables are fully seated, and of course, the wall outlet you are using has power. Do you know if your computer has a video card installed? If it does you may be trying the wrong monitor jack. (you'll know if there's a video card because toward the bottom of the computer, in the rear, there will be a 'horizontal' monitor jack as well as the 'vertical' jack near the serial port - make sure you're using the horizontal one if this is the case). If this has not solved the problem, there's a good chance the monitor is no longer working and should be looked at professionally or replaced. Nowadays you can buy a very nice LCD Flat-Screen monitor for under $150, and you will be able to use it with your 'next' computer as well. Good Luck!
This could be a fualt with either your monitor, graphics system or cable
The monitor is reporting that it is turned on but not receiving a signal from the Pc it is connected to.
Check that your PC is powering on (the base unit)
and check that your cables are connected, and secure (at both ends if both ends undo)
if the fault persists, undo the monitor cable and inspect each end for bent / broken pins.
on a 15 pin monitor cable it is common for a single pin in the center of the connector to be omitted.
if you find that there are bent pins in your connector it is ossible to straighten them using a small screwdriver or pliers, however be careful as these pins are not very hardy to bending and will snap off if repetedly bent.
If you cannot find a fault with the cable and the PC & monitor both are powering up properly, it may be appropriate (if you have a spare or can borrow a monitor), to test on a different monitor, if the fault persists after this there is a fault with your graphics card and you will need to have your PC serviced or replace the Graphics card.
It is quite easy to straighten these pins, however the pins are quite brittle, and do not suffer bending too many times (they just snap)
Does this cable unscrew at the monitor end?
if you have straightened the pin on the cable but are worried that it may be a little weak on that end, swap the ends of the cable round and use the other end to plug into your computer (as it will be stronger)
Also if the cable unplugs at the monitor end it can be replaced with a cable of the same type, available from most computer stockists, just take the broken cable with you for comparison
Is this on a notebook or on your regular PC?The answer will determine what the solution is.
You can first check to see if the little pins on the plug are all straight and none are bent or broken. If one of he pins is bent then you can try gently straighten it (unplug the monitor from the wall first) If any of the pins are broken then either the cable needs to be replaced or the monior has to be replaced.