wondering why when i boot up cpu fan run cd light cd light flashes green power light but nothing no picture Davidw

Because the fans can spin and LEDs flash even in a PC that doesn't work.

So what can i do to trouble shoot this? Davidw

Could it possibly be the monitor? You may want to swap it with another if you're not sure. Does it make any beeps when you start it up? One beep is usually normal. Anything else can indicate a problem. Did anything happen to it between the last time it worked OK and the first time it didn't? Did you open the case to add hardware or clean it out? If you were inside the case could you have forgotten to reconnect something or connected it wrong? Or fiddle with the jumpers? Could you have zapped it with static or could there have been a voltage surge? Next, in case a peripheral piece of hardware is causing the problem, disconnect all the drives and remove all the cards except video. Does it show a posting screen now? If not, you could locate the 'clear cmos' jumper on the motherboard. Jumper it to the 'clear' position, turn on the PC for a few seconds, turn it off and return the jumper to the standby position. Sometimes that helps. If it's still doing nothing then it's the cpu, motherboard or power supply, or a combination of the three. A power supply must supply several different voltages so it could be bad even though fans are spinning and LEDs are lighting up. There's no practical way to test the motherboard or cpu except to swap them out. If it was working one day and not the next and you can be sure that nothing like the above occurred then the power supply is probably the most likely. Unfortunately a bad power supply can sometimes ruin the motherboard and/or cpu.

Is the LED on the monitor green (turned on) or yellow? Yellow would indicate that the monitor, while actually turned on, is not recieving any data from the display adapter. This, at the very least, is the standard. If so, then the CMOS may have an invalid setting that is affecting the display. The best thing in that case would be to short the reset CMOS jumper on the mother board to bring your system back to the BIOS defaults. John W. Borelli IT Specialist OmniIT borelli35

ok no beeps monitor never get the data for the green light to stay lit, not sure what or how it was preforming last time it work cause it was given to me. will ask ny cousin if he can tell me anyting about it thou. also will start with clearing rhe cmos. Davidw