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Use a black image to instantly blank an Apple LCD Desktop
On an iMac G5, it's impossible to turn the screen off immediately. There is a workaround:
  1. Create a screen-sized black image in your favorite image editor.
  2. Import that image into iPhoto (like any picture).
  3. Create a forlder named "Black" in iPhoto, and drag your picture into it.
  4. Open System Preferences -> Desktop & Screen Saver, on the Screen Saver tab, scroll down to the iPhoto section and choose the "Black" folder.
  5. Configure one Hot Corner to launch the screensaver.
That's it; now you just have to put your mouse in the corner of the screen to have a black screen.

[robg adds: Note that this isn't a screen saver as such, just a quick screen blacker. When I wanted something similar for my Apple LCD equipped Mac, I just created a shortcut (using Butler) to fast user switch to the login window...]
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Use a black image to instantly blank an Apple LCD | 17 comments | Create New Account
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Use a black image to instantly blank an Apple LCD
Authored by: inspired_tmu on Oct 13, '05 07:23:13AM

Why not just use a blank screen saver and save on CPU cycles?

Blank screensavers on VersionTracker



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Use a black image to instantly blank an Apple LCD
Authored by: CajunLuke on Oct 13, '05 07:34:32AM

Because those are probably just hacked Cosmos screensavers - remove the other pictures, insert your own, and change the name and the bundle identifier stuff, and voila, new screensaver without mucking around in iPhoto. Therefore, the same thing.



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Use a black image to instantly blank an Apple LCD
Authored by: l3prador on Oct 13, '05 08:16:07AM

What about using Quartz Composer and having Renderer > Clear as the only item?



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Use a black image to instantly blank an Apple LCD
Authored by: CajunLuke on Oct 13, '05 07:23:19AM

I've seen this before, and when I tried it with my iMac G4, I still couldn't sleep in the same room as it, even with the fan muffled. So I still had to put it too sleep.

Yes, the fan noise and the screen brightness of an iMac G4 can prevent me from going to sleep, but the smoke detector doesn't wake me up

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Recommended: Brightness Control
Authored by: randydarden on Oct 13, '05 08:22:37AM
Check out the application Brightness Control at http://www.splasm.com/products/productbrightness.html. It draws a black image (of controllable opacity) over your entire screen. I started using it when Audio Hijack Pro would repeatedly wake my LCD display during the night, every time it started recording a new stream.

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Recommended: Brightness Control
Authored by: ij00mini on Oct 14, '05 03:53:15AM

Brightness control turns off when the screen save goes on, though.



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Use a black image to instantly blank an Apple LCD
Authored by: phlops on Oct 13, '05 08:54:32AM

Don't bother making the image screen sized, save RAM and just make it a 1 pixel gif the screen saver will tile it across your entire screen.

Also, no need to mess around with iPhoto, you can just put it in a folder on your computer (~/Library/Screen Savers/Images/ would be an obvious setup) and tell the Screen Saver prefpane to use that folder.

---
/phil



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Use "Basic Black" screensaver
Authored by: TiBo on Oct 13, '05 10:58:03AM
I am using the "Basic Black" screensaver for so lang now, i thought it was part of the system. It does the same as the above hint, sans the iPhoto detour.

Link to "Basic Black" screensaver on versiontracker.

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Use a black image to instantly blank an Apple LCD
Authored by: PanicRoom on Oct 13, '05 11:16:17AM
The guys at nexus9.org used to have a purpose-built freeware app for this called LightsOut. Command+9 would toggle the screen between black and revealed: simple, effective and instantaneous. The other advantage with LightsOut is that it allows you to cycle through and quit/hide apps via the keyboard shortcuts while the screen is blacked out (which is the real value of the app) — this is something the screen saver method doesn't allow.

Unfortunately, the site is gone and I can't find an existing download mirror. I have a copy of the application (which weighs in at 32KB) and would be happy to pass it on if the interest is there.

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What I Really Want
Authored by: bedouin on Oct 13, '05 02:21:14PM
Is to be able to shut off my Apple 17" LCD at any time, yet keep my secondary CRT running. I've never found a way to do this.

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Use a black image to instantly blank an Apple LCD
Authored by: ChaChi on Oct 13, '05 02:36:51PM
In all of my testings the screen saver by the name of Blank Saver truly uses 0.0% of the cpu! All methods using any size image will consume some cpu.

Just my 2 cents worth on sale ;-)

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Use a black image to instantly blank an Apple LCD
Authored by: leeww on Oct 13, '05 03:12:57PM

I keep a hammer by the side of my screen, never fails.

---
Help!



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Use a black image to instantly blank an Apple LCD
Authored by: jpomni on Oct 13, '05 04:09:22PM

The problem with this hint and all replays in this thread is that these solutions are not really turning off the screen. They are dimming it. If you try mentioned bitmap solution, or black screensavers, screen IS getting black but still in a small room as mine you see exactly that it is not turned off - brightness is very visible and annoying during night time. Of course I can set in System preferences (Energy saver) option to put a display to sleep after one minute. I don't like this either because I don't like to have screen turned off during my work. What really I am missing is a small app, script or command from terminal to turn off the display of my flat panel mac.



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Use a black image to instantly blank an Apple LCD
Authored by: DylanMuir on Oct 14, '05 12:27:12AM

I spent a week or so trying to do this; what it comes down to is interfacing with the power plane of the IO system and telling the screen to shut off. From what I read (and tried) it isn't possible to do this without writing a kernel module. Seems crazy, but that's the way it looked. I'd be very happy for someone to prove me wrong...

D.



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Use a black image to instantly blank an Apple LCD
Authored by: KenaiTheMacFan on Oct 13, '05 07:07:29PM

Just press Control-Eject on desktops and the Power button on laptops. then you can click the Sleep button or press S. On desktops you can also push the Power button to instantly put it to sleep. I'm very surprised no one knew this!

---
Ian



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Use a black image to instantly blank an Apple LCD
Authored by: chych on Oct 13, '05 08:29:20PM

The whole point is not to turn your computer off, just have your monitor turn off. Sleep is not an option.

Anyways I just manually change the display sleep time to 1 minute in Energy Saver, thus the screen is actually off and I can sleep peacefully. There is a way to script this (via applescript or the energy control terminal commands), which I haven't bothered to figure out yet.



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Use a black image to instantly blank an Apple LCD
Authored by: bleed on Oct 14, '05 06:07:10AM

whats the problem with just using the dim button?



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