Hi everyone, I'm new to posting on this forum but over the years it has proven very useful in helping me. So I'm really hoping someone here has a answer to my problem Ok basically what's happen is my optima computer turns on, optical mouse lights up, keyboard lighs however don't light up and the monitor stays in standbye mode and says breifly "no signal". So basically you can not use the computer at all. However if I pull the blue monitor cable out the message on the monitor changes to no cable connected so it's oviously connected fine. What I have tried: Ok so first I tried unplugging the monitor and setting it up on another computer and it worked fine, so ruled out that problem. So I then took the monitor back to the computer that's got problems and tried the monitor cables off the other computer the monitor just tested fine on thinking maybe it was a fault with cables. However this didn't work. So I then left the computer for a few days. Then I tried hooking up a new mouse thinking that maybe the mouse isn't functioning and in turn isn't taking the monitor off stanby mode so it can resume to windows. I thought this because the broken computer is actually running, all lights are on, fans working it's just as if computer from startup is in stanby according to the monitor "if that makes sense". This at first worked, however once the computer loaded to windows it froze on the startup screen. I then had to reset the computer using the main power "as Ctrl, Alt, Del wouldn't work" and on restart we were back to scratch no signal showing again. So again left the computer sit for a week. Unplugged the computer tower today took it down stairs blew out all dust inside it thinking that might be the issue. Then instead of hooking it back up in my sons room were it usually resides, I instead unhooked my main computer and plugged my sons broken one in so it was hooked up to totally different leads and monitor. Amazing enough it worked first go, restarted it numerous times with no problems. So did a bit of a cleanup and a few virus scans, confident it was fixed unplugged it and took it back into my sons room. Hooked it back up, initially it started up fine no problems then froze when I tried to click on the start button. So I restarted it, again it loaded no problems went for a little longer then froze again. Only after that restart were now again back to the no signal coming up on the monitor, mouse still lit up light a christmas tree but no lights on the keyboard. I'm almost positive if I went to all the effort of unplugging it again and hooking it up to were my main computer is again it will work fine. I'm just totally stumped as to what the problem might be. It has to be something causing a issue in that room but I'm really stumped as to what. The monitor was tested and works, the changing of monitor leads didn't make a difference. And all that really leaves different is the power cord. However if the power cord was a issue why is the tower getting power and occasionally running then freezing? If anyone could help it would be much appretiated. I'm so over pulling leads out and carting it around the house lol. And my son is driving me nuts about getting it working for him. I know a bit about computers, have always fixed everything myself when it comes to them, but in saying that I'm not a genious either. I can't afford at this stage to take it to our local computer guys, but in saying that they have never been able to fix something I couldn't anyway. I know this has got to be something simple but it's just driving me crazy. Also if it was a graphics card I would think it would still act up when I changed it's location.