Computer powers on, no beep, monitor is blank

Are you getting any beeps while your computer starts up or when it has already started? If yes, then refer to the following HP Support page to get details about different types of beeps and the respective issue they indicate:
http://h10010.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&dlc=en&docname=c02222922#N315
If you are not getting any beeps, you can start troubleshooting the issue by first checking the connectivity and performance of your monitor. To do this, refer to the steps below:
1)Make sure that your monitor has power and the power light on it turns On when power is supplied to the monitor. If the light stays Off, turn Off the power supply- unplug and plug the power cord- reseat the power adaptor connection on your monitor's end- turn On the power supply. If the monitor's light glows, see if the computer still shows the blank screen. If yes, follow the steps ahead.
2)If your monitor is of flat panel LCD type, unplug its power cord and wait for around 30 seconds so that the electronics in your monitor are reset. Now reconnect the cord and turn On the monitor.
3)If you are still facing the blank screen issue, disconnect all the connected devices to your computer except mouse, keyboard, and monitor. Also remove memory cards from card reader slots (if any) and thumb drives connected to your computer (if any).
4)If the above steps do not resolve your issue, you can try (if possible) to connect your monitor to another video cable (if it is detachable) for testing purpose.
If the issue still persists, you can refer to the HP Support links below to troubleshoot your issue:
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c02217843&tmp_task=solveCategory&cc=us&dlc=en&lang=en&lc=en&product=5296671#N69
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c03561545&tmp_task=solveCategory&cc=us&dlc=en&lang=en&lc=en&product=5296671
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c03518095&tmp_task=solveCategory&cc=us&dlc=en&lang=en&lc=en&product=5296671

GuruAid.com

Hello

If this is the first time to turn you on your computer check first the power supply of your computer if connected to their proper connector. Check your memory if clip properly in there memory slot. If you are using Video Card check it if it is properly connected to the connector. Then connect your VGA connector at the back of your computer when you have video card connect the VGA Cable of you monitor to the video card VGA output if does not have connect it with the onboard VGA output. Then press the power switch if the unit is still no visual in monitor try to search or hear a beeping sound in your computer by its on board buzzer. Find which beep you hear from your computer.

No Beep- No Power, Loose Card, or Short.
One Short Beep- Normal Post,, Computer is OK.
2 Short Beep- POST error, review screen for error code
Continues Beep- No power, Loose Card, or Short
Repeating Short Beep- No Power Loose Card or Short
One Long And Short Beep- Motherboard Issue
One Long and Two Short Beep- Video (mono/CGA Display Circuitry) Issue.
One long and three short beep- Video (EGA) Display Circuitry
Three Long Beep- Keyboard/ Keyboard Card Error
One Beep, Blank or Incorrect Display -Video Display Circuitry

Hope this help with your problem. Keep on touch in fixya

Before you begin
Check the following items before using the steps in this document:
•If you have a flat panel LCD monitor, unplug the monitor power cable, wait about 30 seconds, reconnect the cable and then turn on the monitor. This resets the electronics on the monitor.
•Make sure the monitor has power - the light on the monitor is on. If the light on the monitor is off, the monitor does not have power. Connect it to a different power outlet.
•If the monitor has a detachable video cable, obtain a second monitor cable for testing purposes in case the cable is bad.
•Disconnect all connected devices except the mouse, keyboard and monitor. This includes thumb drives and camera-type memory cards from card reader slots.
With the devices disconnected, restart the computer. If the computer starts and the monitor now displays a picture, a device is preventing the computer from starting. Update the BIOS to resolve this issue.
Step 1: Connect the computer to another monitor
Connect another monitor to the computer to determine which device has the problem (the monitor or the computer). This step is very important to help you determine if the problem is coming from the computer or the monitor. If necessary, temporarily connect the computer to a friends monitor for troubleshooting purposes.
After the monitor is connected, turn on the computer and the monitor. What happens?
•If the newly attached monitor does not display anything , disconnect the cable and continue at Step 2: Is the video connection damaged?
•If the newly attached monitor displays the first startup screen(s) but then goes black, there is a problem with Windows starting. Skip to step 5 .
•If the new monitor works , the original monitor or its cables are faulty. Do the following:
1.Replace the monitor power cable.
1.Turn on the monitor. If the monitor displays an image, you are done. If the monitor remains blank, continue using these steps.
1.Replace the video cable.
Turn on the monitor. If the monitor displays an image, you are done. If the monitor remains blank, continue using these steps.
1.If the monitor does not work after replacing the cables, replace or service the monitor.
Step 2: Is the video connection damaged?
Inspect the video cable and video connectors for damage. Check for sharp bends or breaks in the cable and bent or broken pins at the connectors. With the monitor and computer off, try to straighten bent pins with a small metal tube, like the tip of an empty mechanical pencil or the tip of a retracted pen.
Figure 1: Video connector
If you had to straighten any pins, reconnect the monitor making sure that the video cable is firmly connected and then turn on the computer and monitor. If the display is still blank, continue to the next step.
Step 3: Resetting and updating the BIOS
You can use these steps even though you will not be able to see anything on the monitor.
In case an item was changed in the BIOS, such as the primary display device setting, use the following steps to reset the BIOS back to its default configuration:
1.Turn on the computer and repeatedly press one of the following keyboard keys. Press the key about once every second for 5 seconds after turning the computer on.
◦For HP and Compaq computers that came with Windows 7 and Vista, press F10 .
◦For HP and Compaq computers that came with Windows XP, press F1 .
◦For Compaq Presario desktop computers built prior to 2002, press F10 .
1.Wait another 5 seconds.
1.Press the F5 key. This restores the default settings of the BIOS.
1.Press the Enter key. This accepts the changes.
1.Press the F10 key. This saves the changes.
1.Press the Enter key. This saves the changes and exits from the BIOS.
1.The monitor should display the first screens received from the computer (the logo screens). If not, find and download the latest BIOS update if one is available for your computer.
1.If a BIOS update was not available or the monitor is still blank, continue to the next step.

One beep during startup is "good", but THREE is not good.

Three beeps means a hardware fault -- probably that the video-adapter on your computer has failed.

Connect the monitor to another desktop/laptop, to confirm that it still works.

Turn the computer off, and disconnect the power-cord.
Remove all the RAM, and then re-insert just one stick.
Reconnect the power, and try to boot.
If you still get THREE beeps, turn it off.
Disconnect the power-cord, and reinsert the remaining RAM sticks.

If you still have the problem, then it's time to replace the video-card on your computer. Take the computer to a computer-store, so that they can sell you a video-card that will be compatible with your motherboard.
Hopefully, if you buy the video-card from them, they will install it for a modest fee -- ask them.

Try taking out the hard disk, plug in power and see if you have a display on your screen or external monitor. if same thing happen, try taking out the memory card. If you hear a beep sound it's a faulty mem. card, if no beep sound appears I suspected it's a motherboard faulty.

When you switch on the computer and monitor does the monitor power light illuminated?
If not check the power cable, if the power light is on try connecting it to another computer, if it works on another computer then the fault is in your computer or a faulty video cable (try another video cable).
If the monitor does not work then it is faulty, if it is OK then your computy is faulty.

If the fault is in your computer, you didn't exactly pinpoint the nature of your fault.
Does the power light on your computer illuminated when you power up?
Does your computer actually boot up, does it give and beep code (count the number of beeps - 7 beeps usually means video problems, depends upon the type of BIOS)?
When your computer first boots up and you see POST information on the screen then nothing, it is most likely :-
1. The refresh rate of the video card has been set too high beyond the monitor's specification.
2. Video card configured with incompatible monitor.

If you computer fires up and the monitor is OK the you have a faulty graphics card, you need to replace it.

Computer Post / Beep codes The computer POST (Power On Self Test) tests the computer, insuring that it meets the necessary system requirements and that all hardware is working


POST troubleshooting steps. then this issue is not a NO POST but is an power related issue see document ... For users who are more comfortable working with the inside of their computer.

Good Luck, Please dont for get to Vote/Thank You.

can you chk anything abt the lights on the monitor ? ie.. the small ones near the power switch .. is it green / orange ..

Also do u hear any beeps when you power on your computer ? I vaguely remember that in case you hear three beeps, it could be a video card issue.

- Ranjit

I assume the monitor is still plugged into the back of the system?

If so, do you get any beeps which can denote error codes for the system?  Put your ear to the monitor, any strange whinning noise?

The beeps are probably BIOS beep error codes. Through a series of long and short beeps the computer communicates computer problems that occur early in the startup processes. It's likely the problem isn't your monitor but something in your computer box itself. If you can tell us what the pattern is we can start diagnosing your problem. We'll also need to know the manufacturers name, the specific model computer you have and what operating system you are running.