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LED lights light, fans spin, but NO Signal on monitor.
No Video Signal, because the computer isn't sending one out. Because the computer isn't working.
1) If ALL the LED's were on at once, they would use less than 1 Watt of power.
2) EACH fan uses 2 to 3 Watts of power.
3) A typical processor can use from 51 to 125 Watts of power. Just depends on what Processor it is.
A Power Supply with a weak voltage power rail, will not have enough power to turn the Processor on.
However not to jump the diagnostic flow chart; check the monitor cable FIRST. Use on another known to be working computer. If it checks out OK, the problem is the computer, and I think -> Power Supply.
Test the 3 main voltages on the Power Supply, with a multimeter set to DC Voltage; OR use a KNOWN to be good, Compatible power supply, for a test unit.
For additional questions please post in a Comment. Regards, joecoolvette
Usually you have to toggle the display output on the laptop. The FN key + one of the F# keys with a monitor icon on it. Toggle it until it outputs to the monitor. Your getting "no signal" because no signal is being sent to the monitor or you have the monitor on the wrong input if it has multiple inputs.
when you say monitor can't be found did you mean the monitor has no reactions when you turn on your pc?
here are some test you may need to do to know which part is faulty 1. Turn on your computer, did it display the monitor's logo on screen? When it does monitor is good, when only blank screen it could be the vga cable or the video card. 2. See if the led indication lit. When it lit to steady green, it's good signal is coming in from the video card. It should be followed by screen display. If no display it could be the backlight inverter lamp busted or faulty inverter board. When lit green then turns red, no signal coming from the video card. Check vga cable if fix properly to both monitor and video card. Or may need to reseat properly connection of video card from the motherboard. If no led indication lamp, then monitor is dead. Check ac power cord for continuity using multitester. Check power supply section in the monitor, replaced bulged or blown capacitor with exact value, this components were the first to get affected when lcd monitor failed o turn on. 3. When computer was turned on got display and then monitor turns black, go check the vga cable, Fix the connection properly or may need to replace it with new one. 4. When no signal appears or display blank screen after logo, then check video card. First remedy is to disconnect it the reseat properly to the motherboard. If this have no effect change your video card.
go follow these steps and let me know which is closely to your problem so I can give you a good advise.
"no signal" means exactly that. You monitor is not receiving signal from your PC. Recheck the video cable on both the monitor and the PC, make sure they plugged in properly.. Also try another monitor if you have it, and if it works with that monitor than more likely you have a frequency sync problem. In this case, using another monitor that works, and try resetting the video to basic 60Hz. In Windows, Start->Control_Panel->Display. Change the display resolution to the lowest, apply the setting, then change the monitor back to the questionable one. If it still doesn't work, then your video processor on your monitor is bad; RMA it if it's still warrantied.
if i want turn off the monitor it does not turn off. Connected or not connected is the same while when it was good if there wasn't the signal output the led was orange. Now if there is or there isn't the signal output the blue led blinks
If the signal cable is detachable from the monitor, you could try with another cable...
Regarding the power, I' not an expert, but if you're familiar with electronics basics, like risks of high voltage, soldering, etc, and you'd like to experiment with the unit, then I can give you some hints.
if the monitor green led is blinking continuosly
the follow the steps
remove the cable of the monitor which is connected to the CPU and watch the monitor it should show a message ( no input signal or cable disconnected, that means your monitor is OK the problem is with your CPU . try this and let me know