Power lights turn on but the screen shows no image

posted in: LCD screen | 1

Problem description:

When you push on the power button, the power light on the laptop turns on but the screen shows no image. The laptop screen remains black and blank. Video on the external monitor also not working even though it used to work fine before.

Possible cause:

1. Memory failure.
2. Video card failure.
3. Motherboard failure.

Possible troubleshooting steps and repair solution:

1. Try reconnecting memory modules, maybe one of them is not making good contact with the memory slot.
Try removing memory modules one by one. Maybe one of the memory modules is bad. The laptop might start properly when the faulty memory module is removed.

If you have only one memory module, try moving it to another slot. Maybe the slot itself is bad.

Try replacing memory module with another known good module.

2. If you have a discrete video card, which is not common, there could be a problem with the video card.

First, try reconnecting the video card to the motherboard. Maybe connection between the video card and motherboard is bad.
If reconnecting the video card doesn’t help, try replacing it.

3. In most newer laptops the video card integrated into the motherboard. If the video card fails, you’ll have to replace the motherboard.

If playing with memory modules (as explained in step 1) didn’t help, most likely there is a problem with the motherboard and it has to be replaced.

One Response

  1. hi there I have an toshiba qosmio f20,
    and on the working day i was watching a film on it keeping it over my bed,and on the next day i tried to turn on but there was no disply only the lights,fan and cd rom were working and just after i press power button it turned off, and i removed the ram and then turned on but still no sound or any thing same as first attempt and when i pressed the powerbutton hold for some time then the laptop turned off, what mite be the problem is it on the ram or motherboard or anything else??