I have a Lenovo Yoga thinkpad connected to two Sceptre monitors. I use the two large monitors when laptop is docked. I undocked it and then when I plugged it back in, only one monitor is coming back up. The other one say "No Signal check your input. I have unplugged and plugged back in, checked connections, turned power strip off and on, and still can't get laptop to detect that monitor. Don't see any flashing lights. Help!
Check the power supply
SOURCE: check signal message when data cable unplugged. blank screen when data cable plugged
This problem is most likely to be caused by a bent or broken pin on the CRT video cable at the VGA connector, OR, this could also be caused by a damaged VGA connector on the back of the laptop. If neither VGA connector is at fault, the problem could be caused a damaged (kinked) CRT data cable, or internal damage to the VGA connector on the back of the laptop, though I suspect the problem is more likely to be external, and you probably won't have to disassemble the laptop to locate the culprit...
SOURCE: MONITOR NOT COMING ON . RGB NO INPUT SIGNAL .
You first take post( power on self test) connect power cord & disconnect signal cable you will see massage no signal check siganl cable then problem will be in cpu this problem may be solved by cleaning dust in cpu if montor shows no display then problem will in monitor open it check o/p of smps if not disolder path of eht if o/p comes then eht is faulty replace it
SOURCE: dell m992 crt monitor
If it's getting no signal, make sure the monitor is set for the correct input. This would be either analog (if your cord has blue ends) or digital (if the connectors are white). Depending on wt yhat your monitor is, a button on the monitor will help you set that. If it's set for the correct input signal, then switch out a different cable to see if perchance you have a bad cable out of the box. If there is another PC or laptop setting around, plug your monitor into that to make sure it's good and maybe even plug THAT monitor into yours to make sure there is nothing wrong with your video card. Let me know what transpires. If this takes care of things, please help me out by rating it accordingly.
SOURCE: monitor says: no signal input check video cable .
Sounds a bit bland but either the monitor has failed or the video card
Only test is to plug your monitor into another system and see if it comes to life
If it does then your video card has expired.
If it is part of the motherboard then the easiest option is to buy a replacement which plugs into the AGP slot
They are dirt cheap unless you are into gaming when the sky's the limit
SOURCE: difficulty getting monitor to display when computer powers up
The Problem may be due to the defective inverter unit inside the monitor. Dry to resolder if any dry joint on the inverter PCB or replace the inverter board.
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