monitor error 'no signal input,then when i plug in the back of tower the blue coded,the screens goes black,when i unplug the blue coded from back of tower then the error above comes back on screen,please help
More about :computer tower power continual beeping sound
First and simplest, check the keyboard to make sure no keys are pushed in. Replace it to be sure. Reseat the RAM, check if the fans are blowing. You did not list any computer specs, but check the motherboard for any damage, especially popped capacitors.
The CPU could also have gone bad (too much heat maybe). Solid beeping is usually RAM, motherboard or CPU outside of an issue with the keyboard.