Question about HP Digital Projector sb21 Multimedia Projector

2 Answers

Can't use my hp sb21 with my Macbook

I'm trying to use my HP sb21 with a recently purchased Macbook (Intel Core Duo 2.4Ghz, 4GB RAM).  The Macbook is able to identify the projector, but the projection is fixed in the "waiting for signal" screen.  I'm sure that nothing is wrong with the projector as it works well with my Dell XPS 1210.

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  • Anonymous Jul 18, 2008

    I have the same problem. I connected my 2.6 Ghz macbook pro to an HP sb21 projector and the projector is fixed on the waiting for signal screen...although the projector is detected by the computer.

  • Anonymous Apr 10, 2009

    same problem, the computer recognizes the projector, but the projector does not recognize the computer. (I have a MacBook Pro with OSX)

  • Anonymous Mar 24, 2014

    turns off after 15-20 minutes. Once off, it can be restarted, but then will do the same thing again. I have already blown it out with air, also have switched the bulb to see if that had anything to do with it (no). Used a brand-new bulb to test-- it did the same thing. The machine has been well-cared for and still has about 60% left on the bulb life.

  • Anonymous Mar 29, 2014

    My projector HP SB21 does not respond at all. I thought it was the lamp so I bought a new one (cost me almost the same as the projector itself). Nothing turns on, not even a small indication light. Im Sure it was not the lamp. I tested other cable too and nothing still. What are the other most common parts that burn?

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It works if you do it in bootcamp. but have to select external monitor instead of digital display under the intel graphics control panel. does anyone know of such an option under OSX?

Posted on Dec 14, 2008

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The problem with MacBooks and MacBook Pros with regard to running this projector is the fact that the normal cable had both USB and video running through it. It worked fine with iBooks, but with the MacBook series it no longer does.

One solution with the plain vanilla MacBook is to use a mini DVI to S-video dongle with an S-video cable. Resolution is limited to the S-video (lousy), but it works.

The other potential solution is a combination of cables. Mini DVI to M1 female adaptor combined with a M1 Male to DVI-D Male cable. The cable is available from Cables to Go and by itself provides the proper connections for a MacBook Pro and SB21 projector.

Posted on Oct 26, 2008

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Posted on Jan 02, 2017

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1 Answer

I replaced the lamp in my sb21, but now the right side of the projection is dark. left side is clear and sharp but starts to go dark about midway across. Could the new bulb just need to be cleaned?


Try taking the lamp out and reinstalling it - it may not be all the way in. If this does not help, a polarizer or filter may be bad. It's going to be hard to get replacement parts for this old projector that is at least 11 years old.
The only other thing I can think of is to try a factory reset - look through the menus until you find this.

Sep 29, 2016 | HP Digital Projector sb21 Multimedia...

1 Answer

How do I find the color wheel and clean it


The best answer I have found for this is listed here: http://en.wikipedia.org/wiki/Digital_Light_Processing

If you scroll down the page, you will actually see a diagram as to whee the color wheel is located and, how it functions. Someone took the time to take pictures of the projector and the internals for use in showing how light emits thru it.

Hope this helps.

May 29, 2015 | HP Digital Projector sb21 Multimedia...

1 Answer

Hp sb21 out of sync


Are you simply feeding the projector with a video signal outside the range the projector can accept? For instance, trying to feed HD video to a projector that is not capable of high resolution can produce an out of sync image - or nothing at all.

I assume you've tried using a different video cable to connect to the projector, just in case there is a broken core in the original one that carried the sync signal?

Apr 05, 2014 | HP SB21 Multimedia Projector

1 Answer

Why is the projector looking for a signal?


Need input signal from Computer or DVD player. You will have to select RGB or Video in the projector menu.

Aug 07, 2010 | HP Digital Projector sb21 Multimedia...

1 Answer

Our HP 21 Digital projector has a green tint when we turn it on. We have a new computer and the monitor displays correctly. The HP21 is a 2004 model.


Hi it sounds like you have a ne missing on the VGA feed to your projector, try using a composite lead to see if it is the same it should be ok also you can try using the menu see if the white is white when menu is pressed if it is then it is the lead, it possible could be the VGA socket but i have never seen a faulty socket so unlikely.

Marc Engineer

Jun 14, 2009 | HP Digital Projector sb21 Multimedia...

1 Answer

HP sb21 lamp


There is a very picky sensor on the lamp cover. When the lamp and cover are seated perfectly, your lamp will start.

Apr 07, 2008 | HP Digital Projector sb21 Multimedia...

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