[pumpkinslion]

when i press monitor power on button, error [no signal input or cable unplugged [not sure what this means, no signal? cable,what cable? and then when i plug in the blue part that goes in back of tower,the error message disappears and screen is black but power light is on [its a dell desktop,please tell me what is going on and how to solve this issue,please be detailed cause i am new at this and need to know how to solve this,,thanks.p.s also when i press my tower power on button i see the fan in back running but then it cuts off and when i press tower power on button it blink and shuts off

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error no signal input or cable unplugged - this means the monitor is receiving no video signal from your computer's graphics card, and the cable it's referring to is the thick one that connects the monitor to the graphics card at the back of your PC.

I think your monitor is fine. It's the PC that's the problem. There's a "power supply unit" (PSU) inside the PC and that may be faulty.
Whatever it is, you'll need to get it looked at by a PC repair shop as it could be any one of several things.
Sorry, but there isn't a "quick fix" for this kind of hardware error, you'll need someone to look at it who knows there way around the inside of a PC.

[phillipcorcoran]

error no signal input or cable unplugged - this means the monitor is receiving no video signal from your computer's graphics card, and the cable it's referring to is the thick one that connects the monitor to the graphics card at the back of your PC.

I think your monitor is fine. It's the PC that's the problem. There's a "power supply unit" (PSU) inside the PC and that may be faulty.
Whatever it is, you'll need to get it looked at by a PC repair shop as it could be any one of several things.
Sorry, but there isn't a "quick fix" for this kind of hardware error, you'll need someone to look at it who knows there way around the inside of a PC.