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Re: Display is blank
This may not be the monitor's fault, it should flash a front panel LED when power is applied and most monitors will now flash a message if they are healthy but have no input signal.
Watch if your keyboard lights flash at power on and then the hard drive light on the system box to see if the computer is even booting.
If the system seems dead, you may have to open the case (only a few screws hold one side) and, with the power off, ground yourself on any bare metal you see and then pop the memory boards loose and then reseat them, trace each plug from the power supply (normally a silver box into which the AC is plugged in the back) to its end and if connected, disconnect and then reseat the plug.
If you have an accumulation of dust bunnies, blow them out and if any fans are carrying a bunch of dust, use a clean paint brush to free the blades a bit.
I don't recommend using a vacuum since they can produce a ton of static charge and that can be death to low-level ICs.
I generally will reconnect everything external to the system box and turn on the power before reattaching the side panel removed for access; that gives you a chance to check if the CPU fan is running and any others that might not be visible once the case is buttoned up.
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Hearing fans and hard drive spin up doesn't necessarily mean system is working - just without video. If you heard a POST beep or the Windows Startup sound that would be different - and good. Is there any video on the screen at all, even just a blinking cursor in upper left of display? If not, your problem is probably hardware such as ram or motherboard. If this system has a VGA or HDMI output to connect to another monitor or TV would be a good check, but AIO system usually don't have that option. Other than that, and this is a shot in the dark: Ensure the system is off, disconnect the power plug, and hold the power button in for 30 sec for a power reset. Then plug in system and try powering it up again. If no go, you may have a hardware problem and will need a PC Tech. Hopefully it is just loose ram.
You should check if the vga cable is tightly connected from monitor to cpu. If the cable is connected properly,then the problem must be with your monitor. Check with any other monitor. If you hear a beep beep sound, when you start the computer then your RAM has been damaged or not properly connected.
Most monitors will behave that way if they don't get a signal from the computer so there's nothing to display. A quick check of the monitor itself is to disconnect the signal cable from the computer and then turn the monitor on. Most monitors will display some kind of a message that there's no input and to check your cable connection. Then the power indicator changes color as the monitor blanks out.
You will probably find that your computer isn't starting up when you turn on the power. A common computer problem is that it will turn on when you press the power button, showing a power light and you'll hear the fans inside start running, but it never actually starts running. Then there's no video to the monitor and you see the trouble you described.
The monitor may still be bad. If everything seems to be starting normally and you hear the Windows startup sound through your speakers, but the display stays blank, try another monitor. If that one works, you'll need to have the bad one serviced or replace it. If the test monitor is also blank, the video circuitry in your computer has failed. If the video is built into the motherboard, you can install a plug-in video card as a replacement.
If the computer is turning on but never starts running, that can be a pain to figure out because several things can cause the trouble. The most frequent causes are a bad power supply or motherboard. Bad RAM or a defective drive or other device connected to the motherboard can also keep the board from starting up. The processor itself can fail, but that's not common. I start by removing everything except for the power supply, processor and fan to see if the motherboard is starting. If the motherboard doesn't give a "no memory" error (usually a long beep), you need a power supply or motherboard. Otherwise, the basic hardware is fine, and you can start replacing parts until the trouble comes back, and then you'll know what caused it.
Often there is noting wrong with the display, in most cases the problem is with the computer.
Try the monitor in both of the display outputs your system has, some machines only have one.
If the monitor remains blank on both cases and it works in another computer, then the issue is quite clear that your hp pavilion is not starting up properly, possibly the display adapter has stopped working or similar.
Do you get any beeps from the computer? Have you done any changes to the machine recently? have you tried any other displays with the machine?
If you are in warranty you should get in touch with hp directly to avoid voiding your warranty and get the machine fixed.
If you are outside of warranty, the machine needs to be tested at a professional to confirm the cause of the problem.
Let me know if you need further assistance or if you would like to open up the case of the computer and do some testing. I would expect that you have some experience and know what parts are what, if you don't know anything about the internals of the computer it might be best to just take it to a professional.
If the power light does not turn color and stay's green on startup, it is not a power problem. It is most likely the inverter. If the unit is in warranty, send it out ASAP. Contact HP customer care by email and have the issue logged in.
If in warranty, they will send you a box by FedX second day and have repaired.
This is a 19" monitor and will not be worth paying for repairs if not in warranty.
This is most likely the power inverter board in the monitor - this is common in many monitors. If it started taking longer and longer to display an image, and the power light is blinking on-and-off, that's the problem. You can confirm that it's the monitor and not your computer or the cable by plugging in another monitor if you have one to try.
If it's under warranty, send it back, if not, there are inverter boards for many common models of LCD monitors that are replaceable. The board can run anywhere from $50 on up. Depending on how old it is, you may find it better to just replace it with a gently used one from ebay.