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Old computers can be cured with old tricks... No that doesn't sound right. You probably set your resolution so high that your monitor does not register.
A solution includes pressing F8 on boot until you hear a beep (That means, "I got it, stop pushing" and select Enable VGA Mode. This will enable basic video driver reset to 640x480; because your computer is so old, you should stick with 1024x768 as your highest resolution for a 15 inch CRT or LCD. Always check the manual of the monitor for what resolutions it supports. Your PC cannot even accept another monitor. Specs seem antiquated. Please invest in a new PC soon.
Do you hear any beeps? If not then the computer is not posting past the CPU. You can try to drain the power first by removing the power cord and holding the power button in 15 seconds. if this does not work then you will need to jumper the cmos and remove the battery, repeat the power cord removal and push in the button. If these do not work then you are usually looking at one of two things. either you have a bad cpu or a bad motherboard.
motherboard is doing a check and failing something another component either CPU, Monitor or memory usualy) (google search bios beeps for your make/model) to determine what.
if you cant find it, just ensure the above 3 are correctly seated by taking them out and putting them back in again.
please check on cables connecting the monitor to your tower/cpu. make sure both ends are plugged in tight. check on the monitor power light aswell, if its blinking or not, if the monitor has been more than 5years old too, its possible thats already dead computers have a life time too especially the old models.
Please refix the is display cable properly and check if the issues resolves.
Kindly check if any beep sound comes. To check is the system board is fine. Please press the Num Lock for 2-3 times and check if it responds(Led On/Off) To check the monitor status, please remove the display cable which is coming from monitor and connected with System(Cpu), if it displays the message on screen then it passes the monitor test and indicates that Monitor is fine.
Check if you have several connectors for monitors, and if the cable is plugged in properly.
In case the monitor has a cable with removeable connector, check if that side is plugged in properly as well.
If you use onboard and graphic card together, try to switch from what you try to use now, to the other one (ex. using GFX card now, switch to onboard connector if available, and see what happens). In case your pc/laptop is in standby, push the power button for a second.
If your pc beeps on startup (that's called post signal), consider the mainboard manufactur for the beep code (a few short and/or long beeps). For example, a common but not obvious reason for this problem can be not properly installed RAM. If all that doesn't help, check if the monitor works on another computer. If not, then it might be broken or might need a new cable.
Hi again. The beep codes you describe are memory issues or failure, take the system memory out, clean the contacts and the slots with a clean, soft, dry paintbrush. Re-seat the memory firmly and try boot the PC again. please post back with the results