Every time i turn my computer on it comes up input no signal then goes on stand by i have tried everything

If you monitor has multiple inputs try to change the source of the signal. Maybe a button for input source.

do you have any type of signal going into the tv and is it on the correct input? most tv's will do nothing when powered on, unless it is recieving a signal, IE cable box, DVD, game input, etc. if it has input and still does what you are saying, take it to a tv repair service or to warrenty if it is still in warrenty.

Your monitor may have an option to set it as "manual" or "auto". If set in manual, you will have to turn off the monitor power switch each time. If it has the "auto" setting , it should shut off or "go to sleep" when it detects no input signal.

DVI and HDMI are the exact same signal, except that DVI doesn't include the provision for audio. Essentially the problem you're having is that you have the monitor set to auto input rather than HDMI input or DVI input. Setting the monitor to not look for any input you plug in and defining the input should cause the hunting wait to be eliminated.

Any time a monitor says "no signal" that message is originating from the monitor itself, and not from the computer. A monitor in a room by itself with no computer will say "no signal" for a brief time, if it is turned on. So, if you have tried other monitors also with no luck, then the problem is either the video adapter of the computer, or something that is keeping the computer from booting in the first place (power supply, hard drive, memory, motherboard). A power supply can be tested with an inexpensive tool. Everything else needs either a swap out with a known good stand-in, or else an expensive tool to know if it works.Does the fan come on when you turn the computer on? If so, maybe more likely to be the motherboard, hard disk, or memory. If not, more likely to be the power supply.

Most probably you have power management set to go to stand by after some time. Go to control panel, click on power options, and where it says system stand by set it to never, and turn off hard disk to never, and the turn off monitor you can set it to your needs, for example, I have mine for 20 minutes. 

• check the cable on the monitor screen
• if after removing the data cable from the computer and it has no vertical color screen then
  
• try other data cable
• try other monitor screen
  

mine did the same thing...it was on rgb...didn't have ability to plug in computer to tv as suggested previously and I kept trying to hit input button on side of tv after turning tv on..didn't work but when I pushed input button before turning on tv when i turned on tv input screen was up and was able to move input to hdmi...everything works now.

Power LED on front panel blinks several times, there is a delay, then repeats. After fiddling and fuming (mostly fuming) I found that changing the input signal source allowed the TV to be turned on. When I changed the input signal source back everything was ok.

In other words...

My TV is connected to my PC's video card via an HDMI connector. My card has 2 HDMI connectors. I moved the connector (the part that comes from my computer) from one HDMI out to the other. The screen powered up. When I changed the connector back to the original HDMI out I got my display back.

So yeah, try changing your input signal source. If you're using cable try switching to your Xbox/PS3/whatever, or vice versa. If you only have one possible signal source then I have no clue.

It's almost like the TV doesn't get any signal from the current cable then goes into sleep mode until it gets another signal. My problem had to do with me changing a bunch of sleep/timeout/screensaver settings on my TV/comp.

Hope this helps someone.

When you get the red and green leds lit it means the screen doesn't see an input signal and has gone to stand-by. That the red led goes off when you reconnect suggests a signal has been recognised by the screen but be very aware that it may not be a good signal. As you are using a PC input I will assume the signal is RGBHV, maybe you have the H and V swapped around? I would try another computer source into the screen.
You say you are using the digital harness, please explain exactly what this is.