I can hear the fan spinning, the power light and the light that shapes like a Z in a circle is on but there is no signal on the screen, when I press the power button the computer turns off, when I press it again it turns back on but no signal on the screen.
Could you please suggest what could be the cause of the problem and what could the solution be.
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Re: Screen Don't Comes On Anymore
Have you tried plugging an external monitor into the VGA connector on the back? This would narrow down the problem to either the video card/motherboard or the LCD display itself.
There are several possible defects- as above, the display, motherboard component, video section.
Also, first check the LCD/CRT switching function. On many laptops, there is a function (FN) key which is pressed at the same time as one of the number/function keys (the uppermost row of keys), and this combo will switch display from LCD to CRT & both.
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Can you hear any fan or drive sounds? If you don't hear anything at all when you try to turn the laptop on, no little LED's light up, the problem almost certainly isn't related to the hard drive. So if you don't have a live screen, start with the LCD troubleshooting flowchart, and if you don't have any activity at all, start with the power troubleshooting flowchart. Even if the hard drive has failed at the electro/mechanical level and won't spin up, this wont prevent the LED's on the laptop from lighting up, or the LCD from displaying the BIOS information and complaining about the lack of a boot device.
When you plug in the power cord is there any lightswhatsoever on the laptop, where the plug goes in or on the AC Adapter of thepower cord?
When you press the power button do you hear fans running, hard drive spinning,lights on the computer, hear any beeps or lights constantly blinking, hear theDvD/CD drive click and the light on the drawer of the DvD/CD turn on for asecond or two? If so the laptop is trying to boot or may have booted, butthe screen is not showing for some reason.
Beep tones and blinking lights tells the technicians what is going on with thelaptop and why it is not booting. Most times it's a motherboard issuewhen you hear beeps or blinking lights continuous.
Maybe your power cord is bad if you don't get anything to happen whatsoeverwhen you press the power button. And if that's true maybe you wasoperating off the battery the last time you had it on and since the power cordis bad, it was not charging the battery so the battery is drained and the powercord is bad.
Maybe you have a Static Charge Buildup. Remove the Power Cord, Remove theBattery, then Press and Hold the power button for 30seconds. After 30 seconds plug the power cord back in (leave the batteryout) and hit the power button to see if it boots. If it does, you can putthe battery back in and let it charge.
Hearing ONE beep is normal, and a signal that the computer hardware is OK.
Hearing THREE beeps is a signal that something is wrong:
* burnt-out CPU,
* one of the fans is not spinning (clogged?) or spinning too slowly (about to seize-up),
* one of the RAM chips is defective
* the video-card is not working
If there is more than one RAM stick, remove all but one stick, and start it up, to see if it starts.
Your problem is the memory . YOu have to put off the pc and remove the memory card in the slot. Then clean the silver pins in your memory with a rubber eraser. Put it back and see if the BIOS will be prompted on the screen , if not you have to replace the memory.