IMac g4 1.25mhz monitor problem

I have an iMac G4 1.25mhz. The power supply died. I replaced it, and the boot tone plays, but the monitor is black. No power light on monitor either. Help!

I have been reading and researching, and I noticed that the solution to iMac G4 monitor dark problem is too often to plug in an external monitor. Most of us iMac owners can afford a "better" computer, but would rather have the ORIGINAL iMac 100% working. Display and all.
My problem is (I believe) the inverter assembly, or the video cable. From what I've read, the inverter could just go out, or in the re-assembly process the video cable could very possibly get pinched or otherwise damaged. The video cable is VERY delicate.
I don't know how to tell which is the problem.

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Can I use a 21" iMac as an external monitor?

I'm considering getting an iMac or Mac Mini so I can run Xcode.
My budget is low, so I'm considering just getting a Mini and using it with an old VGA/DVI monitor.
However, as the iMac includes a monitor, mouse, and keyboard, it's actually the same price as a Mini with a mouse, keyboard, and monitor.
Plus, the iMacs are more powerful.
I don't intend to do much on it, just Xcode and maybe some gaming. Gaming is not the deciding factor here.
I've been searching for an answer for hours, and all I found were outdated threads.
My question is:
Are 8GB of RAM really necessary for Xcode, and is the quad-core CPU of the iMac needed?
I also read that an iMac can be used as an external display, but only the 27" models.
I am looking at a 21" 2013 model.
I currently use a Windows gaming desktop, and have lots of extra monitors lying around.
Multi-display support is a must for me, and the iMac screen is way better than anything else I have.
Is it possible to use a 21" iMac as an external display for a Windows machine using a DVI/DisplayPort adapter?
I've read in different forums that "it has to be Thunderbolt". "It has to be a 27" not a 21". "It has to be 2010 or older".
Basically:
Can I use an iMac as an external display for my Windows desktop, and can it be the 21" model?
I'm not getting a Mac very soon, so please take your time.
-Thanks a lot,
Nick
BTW: This is my first post, so it's probably horrible.

Hello Nick, A a warm welcome.. great 1st post too!
I'm afraid using the iMac for a PC Monitor is out, unless it might be a newer PC that has a thunderbolt prt & can output Video through TB port. 2009/2010 iMacs can use MDP. But 21.5" iMacs work as well as the 27" ones for either method.
Not sure DVI or even DisplayPort converters work though.
Here's how it's supposed to work...
http://support.apple.com/kb/HT3924
Mid 2011s & up need Thunderbolt!
http://support.apple.com/kb/TS3775
Are 8GB of RAM really necessary for Xcode, and is the quad-core CPU of the iMac needed?
Well, problem is twofold, 4 GB is barely enough for the OS & one App, & you can't really upgrade the RAM yourself later.
I'd go for the Quad core, computers always get slower over time!
Might be some 209/2010 options here...
http://www.powermax.com/parts/code/PM_CU_IM_I1
http://www.powermax.com/parts/code/PM_CU_IM_I8

How can my iMac support 2560x1080 external monitor (LG 29EA93)

How can my iMac support 2560x1080 external monitor (LG 29EA93)?
Please, help on this issue?
iMac 2012 Late
NVIDIA GeForce GT 640M 512MB
OS X 10.8.5 (12F37)

Thanks for your prompt answer.
I still have problems and I don't know why.

Fixing iMac(CRT) firmware/OS X problems

b I didnt update the firmware on my iMac before trying to install OS X 10.2 or higher on a slot-loading iMac. How do I fix resultant bootup or screen problems?
b Introduction
This topic is a summary of a fuller article which can be found here. It does not apply to tray-loaders but only to slot-loaders. How to differentiate between models
The latest firmware for slot-loading iMacs is 4.1.9. If OS X goes anywhere near an iMac with an earlier version then often peculiar screen problems are caused, or the iMac wont start properly. In most cases it is possible to fix these problems. This topic explains how to do so.
All users who have installed OS X on a slot-loading iMac should make sure that their firmware is at version 4.1.9. Even if the iMac is working at the moment, problems may arise at any time.
If you are having problems then
b do not reset the PRAM
until the firmware is updated, as doing so can make the problems much worse.
To fix the problem you simply need to update the firmware. If your iMac is not behaving properly this can be a little tiresome, but usually not impossible.
b Symptoms
The symptoms are well known and many users have experienced and overcome them:
*     S0: OS X installation attempt fails; there may be a message you need to update the firmware; the iMac freezes (often with a grey screen); the CD is stuck in the drive
*     S1: the iMac starts up but the screen is blank
*     S2: the iMac starts up but the screen is dark and a strange colour
*     S3: on power on or a restart, the green light comes on but nothing else happens
*     S4: after the startup chime the iMac turns itself off after 7 10 seconds
b Overcoming the symptoms
i S0: To get the CD out,
find the emergency eject button inside the right-hand end of the CD slot. Hold it in with a paperclip during power-on. (NB this then disables the CD drive till next power-off.)
i To get round S3,
remove the power cord between reboots.
i To get round S1,
after the iMac has booted, briefly press the main power button to send the iMac to sleep. Wait for the button to pulse orange, then press any key on the keyboard. Usually you will now have symptom S2.
i If you have S2 or S1
and a 400 MHz iMac or later, there may be a VGA connector under a small panel close to the memory access panel on the back of the iMac. Many PC monitors will work if plugged in here.
i If you have S4
then check the suggestions in the full problem solver.
b Upgrading the firmware
The firmware resides on the logic board in non-volatile RAM. To install the latest version (4.1.9) and hence fix the iMacs problems, you first need to boot OS 9.1, or 9.2.x from a local HD. If you have 9.0.x then you can download the 9.1 update from the Apple site.
Make sure you follow all the installation instructions carefully.
Once the firmware is installed (but not before), it is often worth doing an additional PRAM reset: on startup, hold down Apl-Opt-P-R and wait for the second chime.
The most stable version of OS 9 is 9.2.2, so now download and install these updates: 9.2.1 and 9.2.2.
If you need further help then contact Apple Support, check out the full problem solver, or post a new topic in the Apple Discussions iMac(CRT) Usage forum.
Thanks to all contributors.

Giles,
If OS X goes anywhere near an iMac with an earlier version then often peculiar screen problems are caused, or the iMac wont start properly.
You may also want to mention that newer disk utilities such as DiskWarrior can make the iMac boot into Mac OS X, and cause this problem. There have also been a few instances where a user did not believe it was the firmware because they did not install Mac OS X, only boot from it.
(NB this then disables the CD drive till next power-off.)
Could you please fill me in - what does NB stand for?
You may also want to include some sort of disclaimer, that the problem can vary, and is not guaranteed to work for everyone, etc.
Its excellent overall. And, you're not even a full Mac user, which has to make things harder.
Kyle-

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We did that, but it just doesn't seem to be able to connect. So basically we tried to connect to our network and insert the password, but afterwards it does nothing. Weird thing is also that the network symbol (top right of the screen) says that it has been connected, but when I go look at the system preferences --> network, it states that it has not been connected

Can I use my 24" iMac as a second monitor for my Mac Pro?

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By using ScreenRecycler and a network connection.
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Possibly mundane Mini-DVI to VGA into an external monitor problem

Hi,
I've had a look over the interwebs regarding my problem and it seems as if it's not unusual to have external monitor problems but I'm not sure if mine is slightly different:
I had a perfectly working set up with my new Macbook (the white one, '06 model I believe), that was connected to my Hanns-G HU196D monitor via a mini-DVI to VGA adapter, no problems whatsoever. But for a couple of weeks now my Macbook just flickers a light blue colour, with nothing at all on the monitor, and my macbook is unusable until I remove the adapter. I've read about updating firmware but I can't see my desktop once the macbook is connected to the monitor so it's not possible to configure anything. I've read somewhere that my external monitor isn't compatible with this set up, but it was until a couple of weeks ago!
My Macbook's 4 months old now and since then I've bought a new mini-dvi to vga adapter and a new VGA cable, no connections seem loose on either mini-dvi port or my monitor's vga port.
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Jack

You will need to use a mini Dvi-dvi and a dvi-svideo/rca adapter.
Joy joy hallelujah.
Pardon the sarcasm...I just wasted 3 hours of my life trying to sort the issue out.
Heard a KWORLD PlusTV PCTOTV Converter SA235 USB 2.0 Interface would sort the issue out for under 40$ but it's not Mac.
Hope that helps.
~r

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a friend told me that he wants my os x cd for my macbook pro to upgrade his imac.
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HT3275 Hi, I have backed up 2 IMACs and one Mac Book Pro but for some reason, the 3rd IMAC come up with this problem: The backup disk image "/Volumes/Data/Anthony's iMac.sparsebundle" could not be accessed (error -1). Why? They computer system is up to da

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Try this Discussion...
https://discussions.apple.com/message/18783684#18783684

I'm trying to set up a dual monitor for my new iMac. I'm using a second display I used with my old G5. My iMac recognizes the second monitor but the monitor won't turn on. Power button doesn't do anything on the monitor itself.

I'm trying to set up a dual monitor for my new iMac. I'm using a second display I used with my old G5. My iMac recognizes the second monitor but the monitor won't turn on. Power button doesn't do anything on the monitor itself.

If it won't turn on then the monitor is dead (power supply?, video circuits?). Not worth repairing.
If you have a new iMac then it has thunderbolt. So exactly what is that monitor you are trying to connect? For TB you can connect a mini-displayport monitor. Probably (not 100% sure with TB) can use dvi or vga too if you have the appropriate adapter.

Imac not recognizing 2nd monitor

On cold startup, why do I always need to unplug and replug thunderbolt mini display to vga adapter for imac to see second monitor ?
Once I do this, the 2nd monitor is recognized. If I restart, 2nd monitor is recognized.
thanks.. I am worried that the port will be compromised with all the unplug/replugs.
Btw... the "detect displays" function doesn't resolve this issue.
thanks for any help!
~john theaker
windsor ontario canada
iMac 2.8gz quad core 17
Samsung monitor
mini

Hi John,
I really have no idea, but as a test, hold alt key at cold startup, let it set on that screen for maybe a minute or two, then click the startup volume or hit enter... any change?
Also, if you log out & back in does it show up?

Need a Video Out conenctor from an '09 iMac to an external Monitor

Hello,
As I mention in the subject line, I'm in need of a video only connector to go from my '09 pre-thunderbolt iMac to an external monitor. This connector can go to either a male DV or male HDMI.
Thank you!

These optional accessories are available for your model as per Apple:
Options
Accessories
Time Capsule (MB276LL/A)
AirPort Express Base Station (MB321LL/A)
AirPort Extreme Base Station (MB053LL/A)
Apple Wireless Keyboard (MB167LL/A)
Apple Wireless Mighty Mouse (MB111LL/A)
Apple 8x DVD-R Media Kit (M9472G/A)
Apple Mini DisplayPort to DVI Adapter (MB570)
Apple Mini DisplayPort to VGA Adapter (MB572)
Apple Mini DisplayPort to Dual-Link DVI Adapter (MB571)
Apple FireWire Cable (M8706G/A)
AppleCare Protection Plan (MA520LL/A)
iMac 24-inch VESA Mount Adapter (MB060G/A)

I want to use my old iMac G3 as second monitor to my MacBook Pro, how?

I want to use my old iMac G3 as second monitor to my MacBook Pro, how?
Thanks!

You can't really do it in any normal way; that is, using the MacBook's video output port.
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Thank You, Thank You, Thank You! Your solution worked straight away. I've been battling with this for weeks'
Thank you again. :-))

IMac g4 1.25mhz monitor problem

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