Not display not lighting

Fixya does allow full formatting,

line breaks, emboldening,

Indenting Italics

and

1. bullet.
2. numbering.

Take you monitor to a local television repairer. They have the test equipment. It may be blown or failed capacitors that are failing when warm.

That is the correct medication. Follow the link to look for yourself. U23 Pill images Green Round

Acer produces a number of LCD computer monitors. Acer's monitors range from 17 inches to 27 inches. Some monitors offer wide-screen viewing, embedded speakers, high-definition visuals, and various display connection ports. Acer computer monitor problems include common issues such as dead pixels, error messages, and blank screens caused by incorrect connections. Some reviewers have also detected image problems with DVD playback on some models.

"Input Not Supported" Error Message Acer computer monitors such as the G24 may issue an "Input Not Supported" error message when users set the display resolution too high. The G24's maximum display resolution is 1920x1200 with a 60Hz refresh rate. Maximum resolutions vary according to the specific monitor model and according to the capabilities of the computer's video card. b> "Input Out of Range" b> Some Acer computer monitors may report an "Input Out of Range" error message due to incorrectly set monitor refresh rates. Much like the display resolution, each monitor also has specific monitor refresh rates with which it is compatible. Blank Screen or "No Signal" Error b> Like other monitors, Acer computer monitors feature color-coded power indicator lights. If the power indicator light shows green, the contrast or brightness levels may be set too low and should be adjusted via the OnScreen Display. If this does not rid the monitor of a black screen, the monitor may be experiencing hardware failure. The "No Signal" or "Check Cable message" may indicate a problem with the monitor's cable connection with the video card. This error may also appear on a blank screen backdrop if the monitor is plugged into the incorrect port on the computer or if the computer is frozen and needs to be rebooted. Faulty power cords or outlets may cause the screen to be black and to show no power indicator color. b> Image Issues b> Some review sites such as CNET have reported problems with streaking and ghosting during DVD playback on some Acer computer monitors such as the AL1931. (A "ghost" is an identical offset image as the primary or desired image.) Unstable or unclear image issues may be caused by incorrectly programmed VGA timings or incorrectly installed monitor drivers. b> Dead Pixels b> Dead pixels and sub-pixels can cause a variety of display enjoyment problems. Acer will only accept returns on LCD computer monitors that have "more than four (4) defective pixels per million pixels." Further, the central area of the monitor may have no more than one defective pixel. Acer does not differentiate in warranty terms between pixels and sub-pixels. Hope this helps.

Where the display output settings accidently turned on?Try holding down the Fn-F7 keys.

put your vista recovery disc in it and restart it

no boot M9510f,
no boot is like the all time #1 complaint on PCs.
endless posts online on this and for sure at HP.. ever read their forums?
there real name is (and is supported still at HP) is
HP Pavilion Elite m9510f Desktop PC
no statement on screens, is the screen dead, and black
never once see HP logo, never see words to the effect
hit ESC to enter HP setup (BIOS) or F1 or F10 or????? do tell please.
that is first, forget windows now (its LAST)
screen model or maker stated ,
my guess a flat screen LCD
and the front button on it works and the screens local OSD menu works, right?
if PC is dead, the screen is checked first. for sure if BIOS screens in the PC are 100% dead, no text no F1,ESC,F10 keys prompted in text means PC dead or SCREEN dead.


here is HP page on your pc
https://support.hp.com/us-en/product/hp-pavilion-elite-m9500-desktop-pc-series/3824167/model/3876396/troubleshooting


here is black screen tests.
the screen (DISPLAY monitor) has its own brain
and is called OSD, on screen display
we check that first. always........ if screen is made before 2000 year
we trash it.... LOL (before first brains inside )

black screens, Desktop only.
http://pcdied.com/black-screen.html#DT-only

1.Locate the problem pixel. Display a true black image on your HP's monitor. You can do this by playing a DVD on your HP laptop, and pausing it on the black screen just before the movie starts. Once you bring up a black image on screen, the stuck or dead pixel should be visible.
2.Try applying direct pressure to the problematic pixel. After you've located it, turn off your laptop. Place a soft cloth or rag over the pixel to avoid damaging your screen. A soft chamois works well. Using the tip of a pen, apply gentle pressure to the pixel. You don't need to press hard, as too much pressure can crack or scratch your screen. While applying pressure, boot up your laptop. This should force the pixel to begin working properly.
3.Tap the pixel. With your Toshiba booted up and an image on the screen, gently tap the pixel with the rounded end of a pen cap. Tap hard just hard enough to see a small white flash on the screen. Tap your HP's screen until the pixel begins working properly.
4.Download a stuck pixel program. Several programs, including JScreenFix, UDPix and Pixel Protector, are available for download and can help fix a malfunctioning pixel. These programs display rapidly changing colors and images on your screen. The flashing colors and images can force the pixel to begin functioning properly.
5.Contact HP. If none of the above methods work, your screen may have a pixel that is truly dead. If that's the case, the only option is to replace the display completely. Contact HP customer support at www.hp.com to find an authorized repair service near you.

There are two places to look for the problems, the backlight inverter board and the power supply, look for burnt parts, bad capacitors, etc.
http://en.wikipedia.org/wiki/Capacitor_plague
Please post back what you find.

dead

You my friend have a bad backlight. Inside thes LCD monitors there a little tiny flourecnet lights that help the LCD project the images so that you can see what is being displayed. Sounds like your backlight has gone bad. These can be repaired, but can be costly! These things happen often times, 90% of the time I am replacing the backlights to various monitors. Sorry, but I am certain it is your backlight!