Lcd giving no display and giving beep sound - BenQ FP567s 15" LCD Monitor

Hi...
Gives continuous beep sound , When my laptop switch on (Lenovo G585). No display but leds (power & battery) were blinking.

Here are the beep codes for the Thinkpad:" Continuous beeping System board failure One beep; Unreadable, blank or flashing LCD LCD connector problem; LCD backlight inverter failure; video adapter faulty; LCD assembly faulty; System board failure; power supply failure One beep; Message "Unable to access boot source" Boot device failure; system board failure One long, two short beeps System board failure; Video adapter problem; LCD assembly failure One long, four short beeps Low battery voltage One beep every second Low battery voltage Two short beeps with error codes POST error message Two short beeps System board failure.

Changing the battery

If your Tripp LIte Omni 1000 LCD display a fault icon and beeps after changing the battery, try the advice given by the buzzerman which worked perfect in this case:


1. Turn the UPS on. Press and hold the ON/OFF button for one second.

2. Run a Self-Test: Press and hold the MUTE/TEST button for two seconds (until beeps several times). The test will last 10 seconds. All LCD Display icons will be illuminated and the alarm will sound. At the end of this process the fault icon and the beeping turned off.

Hi names Rui, i question for you does your PC give a beeping sound when you turn it on? if does can you tell me how many beeps it gives?

if it give a designated number of beeps this might be the problem i will give you a chart so you can differentiate the warning beeps you hear.

warning beeps:

1 Short Beep DRAM refresh failure
2 Short Beep Parity circuit failure
3 Short Beep Base 64k RAM failure
4 Short Beep System time failure
5 Short Beep Process failure
6 Short Beep keyboard control gate A20 failure
7 Short Beep Virtual mode exeption failure
8 Short Beep Display memory read/write test failure
9 Short Beep ROM BIOS checksum failure
10 Short Beep CMOS shutdown read/write error
11 Short Beep Cache memory error
1 long, 3 short Beep Conventional/Extended memory failure
1 long, 8 short beep Display/Retrace test failed

hope this will determine the problem if none of this warning beep is heard try reseting the power botton in you PC cause sometimes the power botton will loosen cause of continuous use of the botton.

hope this will help you.

Hi What precisely do you mean by VGA display, is your laptop not displaying anything on lcd screen,or its having problem giving display on an external monitor connected via a vga port.
if there is no display on the laptop LCD screen, then turn the laptop on and observe for beeps sounds and hard disk spinning sound if still no display is available plug the laptop to external monitor and again restart the laptop. if there is no display on the external screen and laptop is displaying well in LCD, Then most probably you need to press some keyboard combination on laptop keyboard eg: Fn + f4 , refer to your laptop manual also.

You may have a issuse with the motherboard which the video, sound card etc are intergraded into the motherboard...which may need to be replaced

Sounds like you may need your screen replaced.

Upon turning on your laptop,
Keep pressing F8, until you hear a beep. This will give you the option to boot to safe mode. When you hear a beep, and NOTHING comes on your screen within 20 seconds, you need to have your LCD screen replaced.

Typically if its a hardware problem such as RAM, you'll hear 2 beeps or a POST message will display on your screen, letting you know that a certain piece of hardware failed.

Ive seen problems occur when people change a setting such as :
Right click on your desktop --> Properties --> Settings --> Advanced Button

And changing your DPI. This can cause your screen to go out (Not display anything). If its up to high chances are your LCD screen can not handle it. If you boot to safe mode, then you can fix this. Again if you cant boot to safe mode, then you have a mad LCD.

Give this a try and let me know what happens.

Oh one more things.

One thing i have also seen, more than once, and till this day i can not explain it, but a USB device plugged in. Remove ANY USB device plugged to your computer. Printer, FLASH Drive, Mouse, etc. Then turn on your computer.

If you have a floppy drive, remove the floppy.
If you have a CD/DVD in your tray, turn the computer on to take it out.

system is on but no display. yes i did heard sound 3 beep sound from the motherboards.

you have an issue of no display and as you see that u are betting the knocking sounds, could u plzz let me know are you getting these sounds when you power on the computer with the Fn and the power button, if you are able to listen to the sound but there is nodispaly then its a no video issue . in order to determine whether its an issue with the LCd you can connect an external monitor to the laptop and power on the laptop then hold the Fn key down and then press the F8 key and release both the but keys, look for the display on the m#external monitor , toggle the keys a couple of times , if you are able to see the display on the external monitor and not on the LCD , then u have to open the cover above the keyboard (hinge cover) and reseat the LCD cable, if there is still no display then the LCD has to be replaced.

Let me know once you try these steps...

all the best :)