No boot and purple screen

My couple of weeks old iMac didn't start on boot-up the other day - just stayed at the grey screen and then darkened as if about to go to screen saver. Had to force a restart and then it came on. Can't remember if there was a chime or if the fan was running. This has not reoccurred so far.
Today while working the whole screen suddenly went purple - like vertical purple corrugated cardboard! Once again a forced restart solved the problem. Disk Utility found no problems and I have now repaired disk permissions but am worried that I have a defective iMac.
Has anyone had similar problems?

Hello and welcome to Apple Discussions..
Disk Utility found no problems and I have now repaired disk permissions
Repairing permissions is one thing, repairing the startup disk is another.
Boot from your install disc, run the Disk Utility app.
Insert your install disk and Restart, holding down the "C" key until grey Apple appears.
Go to Installer menu and launch Disk Utility.
(In Mac OS X 10.4 or later, you must select your language first from the installer menu)
Select your HDD (manufacturer ID) in the left panel.
Select First Aid in the Main panel.
(Check S.M.A.R.T Status of HDD at the bottom of right panel. It should say: Verified)
Click Repair Disk on the bottom right.
If DU reports disk does not need repairs quit DU and restart.
If DU reports errors Repair again and again until DU reports disk is repaired.
When you are finished with DU, from the Menu Bar, select Utilities/Startup Manager.
Select your start up disk and click Restart
While you have the Disk Utility window open, look at the bottom of the window. Where you see Capacity and Available. *Make sure there is always 10% to 15% free disk space*
Carolyn

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Lenovo G560 - Issue with won't boot and black screen after HDD upgrade

Lenovo G560 - Issue with won't boot and black screen after HDD upgrade.
What happen: My laptop was working fine, no blue screen issue, no funny business at all. I bought a new SSD Intel 120 GB and thought it would be a good idea to replace the HDD. I shutdown and disconnected the power adapter, waited a couple of minutes and removed the battery. I opened up the back case and replaced the HDD. And put all the screws back and put the battery back in.
Problem: The very first time I turned the power on, nothing happens besides a black screen. I pressed the dvd drive it works and opens up and closes. I waited for about 30 mins and still has blac screen. When I mean black screen, no bios menu, no logo, just a black screen with the fan sound on.
I have tried these:
1. Unplugged everything - battery, adapter, and pressed the power on button for about 60 seconds, nothing, the laptop turns on with the LED display on for both on and battery LED's. But nothing but black screen, no sound of windows loading just the fan and black screen.
2. I tried putting back my old 2.5" and nothing but black screen.
Thoughts and suggestions?
Solved!
Go to Solution.

Hi Autoexit173,
Welcome to Lenovo Community!
As per the query we understood that you are facing issue with system not booting in your Lenovo G560 laptop.
As you have mentioned that the system not booting, please try to remove the RAM and turn on the system and check if you can hear any beep sound. Also try to clean the RAM slots and check for the issue.
Click here for the steps to remove the RAM and refer page number 40.
Hope this helps. Do post back if issue persists!
Best regards,
Ashwin.S
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Audio only, green and purple screens on quicktime on pc

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Open your QuickTime control panel (either via the Control panels, or by going "Edit > Preferences > QuickTime Preferences" in the Quicktime Player). In the Advanced tab, uncheck Enable Direct3D video acceleration:
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I really hope someone can help.
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I tried and tried but it just would not boot and the screen did nothing but remain blank.
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I am not very technical so of you do know how to help then please explain as simply as possible.
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Hello Sarah
You cannot expect that someone here on this forum can offer exact diagnostic and say for sure what the problem can be. We can here just speculate what the problem can be.
If you want to know for sure what the problem is contact nearest service and let them check your notebook.
It can be mainboard failure, maybe just defective CPU or defective board electronic. Who knows?
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Hello people,
We've got a newer 27" iMac bought in 2010. Anyhow, yesterday we experienced a power outage. We installed a surge protector on the house but it didn't do our iMac any good. The iMac will cut on but goes to a purple screen only showing the speechless box. We can't get it to do anything else besides moving the courser. Does anyone any ideas as to what is going on and how to correct it?
Thanks in advance for and help or advice,
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Hi, I have a MacBook Pro Mid 2011 with Mavericks (came with Snow Leopard).
History:
One day i was working and things were too slow. I tried to restart but it was taking too long to close all the programs. So I forced shut down by holding the power button. When I turned it on again, my problems begin.
Problem:
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I found this to work at least to get in and backup some files. It is VERY important to put these commands in EXACTLY as seen here, including spaces.
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/sbin/fsck -fy /
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mkdir /Disabled_System_Library_Extensions
cd /Disabled_System_Library_Extensions
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exit
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http://apple.stackexchange.com/questions/120507/boot-hangs-on-grey-screen-even-w hen-booting-from-usb-drive-with-fresh-os-x-inst

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+I only see a purple and green screen with lines that flash.+
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Is the drive "grayed out" in DU or just not present?
I then put just the stuff I use back on.
Did this include any system stuff?
-mj
[email protected]

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I recently bought this laptop that had everything to satisfy me, unfortunately, I've been encountering a problem since yesterday night and I want to try everything reasonable before bringing it back to guarantee.
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I wasn't able to find the recovery CD like you suggested, I'm not even sure it was in the box - then again, I'm not the most tidy person in the world and it could be anywhere in the room as far as I know...), but thank you anyway for taking the time to reply. =)

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imac g4 flat panel Mac OS X (10.3.5)
imac g4 flat panel Mac OS X (10.3.5)

Perhaps, if the problem is not caused by a hardware issue or failure,
you may be able to open up the bottom and use the Power Management
Unit Reset (button) that is hidden next to the airport wireless card location.
There are a few expensive parts that could also be to blame for this issue;
and a trip to the repair shop for a diagnostic may be warranted.
The PMU reset is a small button; there are some instructions in the service
manual I happen to have a copy of... that won't help you much! I saw in
another post in Discussions, where someone had linked to an XLR8 take-
apart page for the iMacG4, maybe it has this button clearly marked. The
button is rather hard to see once the metal plate is removed from the iMac
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The PDF service manual page is #108+, for details on PMU location/reset.
The image is most helpful; and the orientation is not mentioned in this
manual I have. Looks like the button has a little picture on or above it
that looks like a tiny battery; you press this ONCE. Twice will do bad.
The little picture is part of a row of small details under a plastic cover,
near the Airport Card slot where the contacts are for that to connect.
Here is a quote from the procedure page of the manual; please note
there are other tests and things not mentioned that a service tech could
perform to better diagnose that machine's problem. [Pg 108-109]
"The PMU Chip"
The PMU (Power Management Unit) is a microcontroller chip that controls all power functions for the computer. The PMU (location shown below) is a computer within a computer. It has memory, software, firmware, I/O, two crystals, and a CPU. Its function is to: • Tell the computer to turn on, turn off, sleep, wake, idle, etc. • Manage system resets from various commands. • Maintain parameter RAM (PRAM). • Manage the real-time clock.
•Important: The PMU is very sensitive and touching the circuitry on the logic board can cause the PMU to crash. If the PMU crashes, the battery life goes from about five years to about two days if the PMU is not reset.
•Refer to the next topic, “Resetting the PMU on the Logic Board” for the procedure. Many system problems can be resolved by resetting the PMU chip. The PMU reset button is located on the right side of the board, refer to the picture (not here.)
"Resetting the PMU on the Logic Board Resetting the PMU"
(Power Management Unit) on the logic board can resolve many system problems. Whenever you have a unit that fails to power up, you should follow this procedure before replacing any modules.
1. Disconnect the power cord.
2. Remove the user access panel from the bottom of the computer. 3. Press the PMU reset switch (shown below) once on the bottom side of the logic board and then proceed to step
3. Do NOT press the PMU reset switch a second time because it could crash the PMU chip.
4. WAIT ten seconds before connecting the power cord and powering the computer on. If the computer powers on, go to the next step.
If the computer does not power on, there is something else wrong with the computer, refer to the symptom/cure, “No Power” in this chapter.
There could be a hardware failure, and if you cannot boot from the
Apple Hardware Test (on supplied CD or boot DVD) you should take
the computer to an authorized Apple service providor for testing, etc.
Best of luck in this; & thanks to Apple for the information posted above.

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Sometimes, when booting the laptop, instead of the normal red "TOSHIBA" screen and the Windows XP startup message, the laptop simply shows some weird white and purple clouds fading across the screen, eventually fading to a very dark but not quite black screen.
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Sometimes my computer will be operating normally, then completely lock up (mouse and all) and will reboot with the clouds!
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Any ideas?
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Well I can assure you my laptop has an InfraRed Port on it - I used to use it with my mobile phone for various things but don't bother now.
Good idea about attaching another monitor - hadn't thought of that. I will see what I can come up with.
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Will definitely try attaching another display though. Good thinking.
Thanks,
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Boot from the install DVD and repair the startup drive
Then run hardware test
Using Apple Hardware Test
Reinstall the OS
Last
Make an appointment at the Genius Bar of an Apple store.
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