I'm getting only a black screen ?

could be a problem graphic card , failing
if you have a plug in card , then reposition the cable back onto the mother board monitor connection to test

Typically the graphics card went out. Other possibilities include, loose monitor cable or short in the cable, or incorrect graphics driver installed or missing, or monitor is shot (least possible). Things to look for: When booting up are you able to see words in the monitor or is there a series of non-regular error code beeps? If beeps then most likely your graphics card is either loose or fried, or incompatible. If you it works fine, but the light on the monitor turns orange and screen goes black, then it's most likely a loose monitor data cable or there is a short in the cable, or monitor's power cable is loose. Then check both connections, power and data on the monitor, and also where it hooks to the computer make sure it's screwed in snug.

Graphic Card is corrupt so no display on the LCD screen and the display on PC monitor is fine
Change the graphics card

If the screen keeps going black and you know thet your graphics card is ok (test monitor on another computer), then the issue is probably with the internal monitor power capacitors, which you will need to take to a TV repairman to have inspected

Sound slike it is getting no video from your graphics card. Check the graphics card in device manager, and check the card is seated properly, the connections are good and that the drivers for your graphics card are there.

Seems that you have set the resolution on your graphics card to a setting higher than the maximum resolution supported by your monitor.
Try to boot into Safe Mode & lower the resolution of your graphics card. If not possible, go to Device Manager & remove the graphics card from it, then reboot your computer. This will reset the resolution.
You can then re-install your graphics card drivers & get it to work properly.

It appears that you are losing the video connection between your computer and the the monitor. Remove the conector from the video card and reconnect it again, make sure the connector is firmly secure. If the problem still persists you could have a faulty video card and it needs to be replaced.

If the video card is built in on the motherboard, you still need to purchase a new video card (buy a AGP graphics card), insert into the AGP slot of your computer, you may need to disable the onboard graphics card - go into the BIOS to do this, and you need to install the new graphics card driver.

It could be either of these:

You're monitor is dying and you need a replacement (Starlogic brand is notorious for dying early and giving poor performance)

You're graphics card is going out. If you have an extra monitor laying around, take out the Starlogic one and plug in the other to see if the same results occur, if not, it's the Starlogic monitor, if the problem still persists, you need a new graphics card or need to update your current drivers.

well your screens broken mate the only thing you can do is get a new one