Dual 2.5 cooling issue: Won't boot.

I have a dual 2.5 G5 that I've had since it was new in in july 2004. It's never given me any problems.
Recently it started "gurgling" (it's the best way to describe it). I was worried about the dreaded leaking issue so I tore it apart looking for leaks.
Good news: No leaks. Bad news, it won't boot now.
In the process of assessing the situation I checked the coolant level. To my surprise the system was pressurized quite a bit, even though it was stone cold. I don't understand this. I also get the red LED's on the mother board glowing indicating overheat, the cooling fans run at high velocity, and the computer won't boot.
I am in the process of rebuilding the water pump as a preventative measure, resealing the two O-rings and the diaphragm. Everything seems in working order.
I hope it will boot once I reassemble it, but I'm in a situation where I MUST have it up and running by monday.
Any suggestions?

Hi tarmaque-
It may not be so much about pressure as air in the system. You said yourself that it was pressurized when you disassembled it. That is a huge clue! That fact alone would certainly make me think that there should be pressure.
I think the higher boiling point under pressure is a factor. There isn't much fluid and it must dissipate a lot of heat.
Water cooled engines absolutely are "pressurized"-ever take a radiator cap off of a hot engine? A cooling system must be able to handle pressure as (duh Daddy) liquids expand when hot.
Luck-
-DP

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This thread may be helpful -> https://discussions.apple.com/thread/4766577?tstart=0.
You should at least add your experience and see if those who have come up with 'quick fixes' can help you with your problem.
Good luck,
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K7N420 Pro -- RAM issues -- won't boot/crashes

System info:
CPU: AMD Athlon XP 1900+
Motherboard Model: K7N420 Pro
Memory: (Varying, this is the problem, explained in post: but to begin with the system had 2 modules of 256MB PC2100 266mHz. Brand name unknown, some generic manufacturer. For reference's sake, the motherboard has THREE memory slots)
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Operating System: Windows XP Professional Version 2002 Service Pack 2
Power Source: Addtronics 300w (3.3v/18a, 5v/30a, 12v/9a)
Okay, so obviously we've got an old, old beast here.... But she's served me well, and I'd like to get a little more out of her. So here's the ongoing (very long, I'm sorry) saga:
The computer started doing crashing on me some time ago; lots of Blue Screens of Death, no error messages that gave me anything reliable to use for diagnostic purposes. Eventually it just wouldn't even manage to boot, each time would give me a BSOD. I opened the case up, checked for anything obviously visually wrong (blown capacitors etc), did a good thorough aircan dusting, popped out the two 256MB chips (let us call them Chip and Dale), and popped them back in.
This did indeed have a result- now we didn't even make it to the BSOD! All I got was a repeated ominous beeping and nothing coming onto the monitor at all. I then tried to put in only one chip at a time. Results: Chip works in slots #1 and #2, but not #3; Dale works not at all. (By "works" I mean the computer boots normally and runs normally, for at least an hour, the most I've tested it. Runs SLOW, of course, at 256MB, but runs. By "not works" I mean we get nothing on-screen, and the repeated ominous beeping.)
I presumed I had bad memory on my hands with Dale and that I needed new memory anyways, so I headed to Fry's and picked up two sticks of Patriot 512MB PC2100 DDR 266mHz-- the same specs as the old memory, excepting that it is 512MB instead of the 256. (According to Crucial.com, my motherboard's slots should each be able to support 512MB.) Let's call the Patriot 512 chips Bill and Ted.
Results with the new memory: Neither will work in slot #3. Logic dictates slot #3 is bad. Bill will work in slot #1 or slot #2. Ted will work only in slot #1. The computer will NOT boot if both Bill and Ted are occupying slots. (It also won't boot if Chip is occupying a slot and either Bill or Ted are in another slot.)
(Doesn't this sound like like one of those old logic problems where you have to sort out who owns which house?)
So the best I can get out of her right now is to stick Bill or Ted into slot #1 and proceed with the same 512MB that Chip and Dale used to give me back when they cooperated. However, new wrinkle: neither Bill nor Ted will get along with the computer for anything more than about a half-hour-- then, the computer crashes, tries to auto-reboot, and starts doing Black Screen and Ominous Beeping again. The RAM has to be popped out and put back in before it will boot normally.
*deep breath* I know that was long, thanks to anybody who read this far. Does anyone have any ideas as to what could be causing these problems and/or how to fix it? I've reached the end of all the knowledge I can put to work on this problem.
If I haven't been clear on anything, please let me know, I'll try to answer.

Hello,
Are you 100% sure that slot 3 is clean/dust free?
Memtest is a program that writes patterns to the memory.
The program then tries to recall the pattern(data) stored in the memory location.
If the memory is faulty the pattern(data) may have altered (goes corrupt) and the program will report an error.
Use just 1 stick at a time in slot 1.
Patriot Bill, let memtest run for say 3 hours.
If everything is ok you will not see any errors on the screen.
Then turn off and remove patriot Bill.
Insert patriot Ted into slot 1.
Run memtest again for 3 hours.
Again if everything is ok after the 3 hours it means that both Bill and Ted are ok.

G5 Dual 2.5 Cooling Issues?

My computer is typically on for long periods of time when I am working and so this problem is rarely an issue that causes problems, but it seems problematic for a machine of this design (its not like I'm on a Windows machine). Any time that I have been working on the machine for a little while, no matter how little work the computer does, it will not start back up immediately. The power button lights up but the computer does not start up. The only remedy that I have found is to wait, after a while (longer/harder the computer was running the longer I have to wait) it starts up and runs normally. I assume that it is a cooling issue because of the relation to the computers work load and how long it takes to work again. This used to occur some of the time, now it seems to be a guarentee that it will occur any time the computer is running for a while, hour or so. Anyone have any experience with issues like these or understanding of what is going on I would appreciate the input.
Thanks.

I downloaded Temperature Monitor
and my first processor is getting up over 200 degrees
F. I
That's getting up there near thermal shutdown. It sounds like your LCS may need to be replaced.
-Bmer
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MacBook Pro HD issues; won't boot to any drive; need to recover data

*Apologies in advance for the lengthy post. I just want to be sure I include as much detail as possible. Thanks in advance for reading all of this and offering any thoughts and suggestions.
I have a 13-inch late 2011 MacBook Pro running OS 10.7.
The computer recently began booting slower and slower until finally one day it did nothing but show the gray boot screen with the apple and a spinning circle and/or progress bar at the bottom. It won't do anything else. I assume it's the HD; no surprise there. What's killing me is that no matter what I do, I can't boot to any disk, internal or external, can't mount it in target disk mode, and can't repair it or recover data, which is a first for me with any HD. However, the computer still clearly sees the drive, and the drive sounds and runs normally (meaning no clicks; appropriate amount of whirs and such).
What I've done so far:
Reset PRAM — no help
Reset SMC — no help
Boot in Safe Mode — same result as regular boot: gray logo screen with spinning wheel
Disk Utility message:
Verify Disk — "Error: This disk nees to be repaired. Click Repair Disk."
Repair Disk — gets as far as "Checking catalog file" then shows "Keys out of order". Next is "Rebuilding catalog B-tree." Then "The volume Macintosh HD could not be repaired."
fsck — same as Disk Utility: "Keys out of order (4, 22016)", "Rebuilding catalog B-tree", then "The volume Macintosh HD could not be repaired." FILE SYSTEM WAS MODIFIED." ...over and over again
If I hold Option while starting the computer, it gives me only two drives to boot from, regardless of any other external HDs or flash drives I have attached: Macintosh HD (internal), and Recovery HD (internal partition). If I choose Macintosh HD, it's hit or miss whether it prompts the Disk Utility screen or just gray-screens forever. If I choose Recovery HD, it successfully runs Disk Utility every time. Here's the thing, though — if I attach an external HD, it doesn't see it during the initial Option-startup. However, from Disk Utility I'm able to select a startup disk from the menu to restart into. It sees the externals in there every time and lets me select them as startup disks, but upon restart it returns to the gray Apple logo screen with spinning wheel and/or progress bar at bottom. Sometimes it also sees the internal Macintosh HD here, but selecting that is useless. I can't actually boot from any disk, internal or external, running full OS or even just recovery software.
I've tried using TechTool Pro 8's edisk and ProToGo bootable drives, but again, the MacBook only sees them from Disk Utility only (not on Option-start), and I can select them, but it doesn't actually boot to them; it reverts back to gray screen.
I've installed a full version of OS 10.10.2 on an external hard drive, complete with DiskWarrior 4 on it, but same problem as above — it sees it in the "Select Startup Disk" menu, but not in the initial Option-start or successful reboot.
I've tried booting from a DiskWarrior 4 DVD using C-startup. It recognizes and spins the DVD from the get-go. Eventually it boots to it (after about 20 minutes or so of reading the DVD). I'm able to launch DiskWarrior 4 and start a rebuild. However, it goes all the way through "Step 6: Constructing optimized replacement directory... Overlapped files detected: 7 ...Step 7: Finishing construction ...Step 8: Reading from disc, one moment please..." and then the computer kernel panicked. This happened several times. I reset the PRAM again, then retried DiskWarrior DVD boot, this avoided a kernel panic and it got as far as "Comparing directories... Step 9: Recording any file or folder differences; 3,449,089,956 tests..." and then DiskWarrior and the computer both freeze and I have to force shutdown.
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Disk Arbitrator immediately sees the the faulty laptop HD, but won't let me mount or unmount it. It's just there, grayed out.
Data Rescue 4 is able to see the faulty laptop HD through Target Disk Mode, even though the drive itself will not mount to my desktop. I am able to scan the drive using DR4, and start a data recovery process. However, DR4 is dumping all recovered data into "User Defined" ai (Adobe Illustrator) files, which makes absolutely no sense at all. What's more, the files aren't able to be opened by any program. Even files that it hasn't recovered into ai files, like txt and mpegs, cannot be opened. I've tried recovering from both the drive itself and from a clone of the drive (made through DR4), with the same result each time.
So, all of that said, I guess my first question is what the **** is going on? The drive mechanically is functioning fine, but there seems to be an issue with its readability (and the directory/files?).
What's more, why won't this laptop mount ANY drive? I should be able to Option-boot into any drive, especially if the USB ports, drives, and OS's are all fully functional, right? Is there any workaround I'm missing? Even if the internal drive and data are just screwed, what's causing a total lack of mounting or booting of any drive, internal or external?

Holy crap, I got it to work.
Essentially, I just waited until DiskWarrior reached Step 9 and told it to skip the step before it had a chance to freeze. It skipped successfully, moved on, rebuilt and replaced the faulty directory files.
So far the computer is booting like normal, I can log in, and I'm currently copying all of the data to an external as I type this.
I still have no idea why the computer wouldn't mount or boot to any drive, but I guess I'll deal with that later.

Format issues- won't boot from OSX disc

Help!
I've been having some issues with my iBook G4 recently (it seems every program will randomly quit unexpectedly and it's generally rather slow) so I was thinking I would just wipe the drive and start afresh.
But I can't seem to boot from the OSX install disc. There's an option in the disc itself to restart and that didn't do anything and pressing "c" while restarting still starts things up normally. I've tried zapping NVRAM, PRAM, I went through OF and did reset-all and set-defaults (I'm not even sure if that was necessary- I'm desperate!) and nothing will work.
Help, please!

In order to erase your internal hard drive, you have to be booted from something else. I think you could do this from another Mac in FireWire Target Disk Mode, but I have never done this myself.
http://support.apple.com/kb/HT1661
Is there a reason you don't want to use FireWire?
The biggest problem still seems to be that either your disc or your optical drive is not working properly. Even if you do succeed in erasing the drive, there is still the problem of reinstalling the OS. I think there are methods of doing this with FireWire Target Disk Mode, but I have just never done it myself, so I hesitate to give any instructions.
If you can, you might see if you can borrow an external optical drive and see if you can boot using that. If so, you can erase and reformat your internal drive using Disk Utility and reinstall the OS that way. If an external optical drive won't work, there may be a problem with your disc.
Good luck!

CD/DVD-rom Issues; Won't Boot

   Hi, I am having a problem booting when I remove my CD-Rom 'Slave' or try to replace it with a DVD-Rom.
Below I will give my computer specs.
I have 2 hard drives, so the Primary IDE slots hold my 2 hard drives; one a
Master and the second one is the slave to the master.
On the Seconday IDE slots, I also have 2 cd-roms, one is the master and the
other is the slave to the master. The master is my cd/read/write cd-rom. I
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rom)...
I bought bestbuys dvd-rom, took out the 'slave' cd-rom and put the dvd-rom
in with the pin set for the slave. I booted my computer and it wouldn't boot
pass the first booting page. It wouldn't boot into windows.. What could be
wrong?????????
I took the new dvd-rom back out and left the secondary slave empty and tried booting and it
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least.. Like I said the secondary IDE slot is the Master of r/w cd-rom and I
never removed it or touched it, it is still there..
I then put my old cd-rom back in the secondary (slave) and waited a few
mintues and booted up my computer.. It booted with no problem.. I repeated
this whole sequence several times with the same results.. I for the life of
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cd-rom (slave), shouldn't it????? Adding a cd-rom or a dvd-rom should not keep my
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In my cmos, I have it set to boot-up with the hard drive as my first
boot-up, the second is the cd-rom.. but I don't see how removing or replacing
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Yes, I have check the cables, settings and everything in my whole computer.
Can someone please tell me what is causing this.. I need a dvd-rom drive.
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SYSTEM INFORMATION:
Mother Board: K7N2 Delta series MS-6570 (v1.X) ATX Mainboard
AMD Athlon™ XP 2500+ 1.84 GHz, 2.00 GB Ram
OS Name   Microsoft Windows XP Home Edition
Version   5.1.2600 Service Pack 2 Build 2600
OS Manufacturer   Microsoft Corporation
System Manufacturer   NVIDIA
System Model   AWRDACPI
System Type   X86-based PC
Processor   x86 Family 6 Model 10 Stepping 0 Authentic AMD ~1837 MHz
BIOS Version/Date   Phoenix Technologies, LTD 6.00 PG, 11/7/2003
SMBIOS Version   2.3
NVIDIA GeForce 6800 GT Video card 256MB
System Directory   C:\WINDOWS\system32
Boot Device   \Device\HarddiskVolume1
Hardware Abstraction Layer   Version = "5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)"
Total Physical Memory   2,048.00 MB (just updated my ram from 512 mb last week)
Available Physical Memory   1.59 GB
Total Virtual Memory   2.00 GB
Available Virtual Memory   1.95 GB
Page File Space   2.60 GB
Page File   C:\pagefile.sys
Power Supply 400 Antex (ATX12V)
Primary IDE
Master 40 GB Hard Drive
Slave 160 GB Hard Drive
Secondary IDE
Master CD-R/W Rom: TDK 52x EIDE
Slave to Master CD-R/W Rom: MTRP 50x EIDE
This is all it gave on the storage/ide under my system info;
Storage/IDE
Name   Standard Dual Channel PCI IDE Controller
Manufacturer   (Standard IDE ATA/ATAPI controllers)
Status   OK
PNP Device ID PCI\VEN_10DE&DEV_0065&SUBSYS_57001462&REV_A2\3&13C0B0C5&0&48
I/O Port   0x0000F000-0x0000F00F
Driver   c:\windows\system32\drivers\pciide.sys (5.1.2600.0 (XPClient.010817-1148), 3.25 KB (3,328 bytes),
Name   Primary IDE Channel
Manufacturer   (Standard IDE ATA/ATAPI controllers)
Status   OK
PNP Device ID   PCIIDE\IDECHANNEL\4&26D47942&0&0
I/O Port   0x000001F0-0x000001F7
I/O Port   0x000003F6-0x000003F6
IRQ Channel   IRQ 14
Driver   c:\windows\system32\drivers\atapi.sys (5.1.2600.2180 (xpsp_sp2_rtm.040803-2158), 93.13 KB (95,360 bytes),
Name   Secondary IDE Channel
Manufacturer   (Standard IDE ATA/ATAPI controllers)
Status   OK
PNP Device ID   PCIIDE\IDECHANNEL\4&26D47942&0&1
I/O Port   0x00000170-0x00000177
I/O Port   0x00000376-0x00000376
IRQ Channel   IRQ 15
Driver   c:\windows\system32\drivers\atapi.sys (5.1.2600.2180 (xpsp_sp2_rtm.040803-2158), 93.13 KB (95,360 bytes),

With the one drive alone did you remove the jumper?
Sometimes drives are picky and fight over who is master/slave. Try switching them.

G4 Dual 1.25GHz (Mirror doors) won't boot

Hi
I wonder if anyone can help me? My Mac as per subject line has ceased to boot for no apparent reason. Albeit it had several expansion cards, more memory, bigger hard drive etc. failure did not occur after performing any of these upgrades but just out of the blue. Stripping it back to base configuration as best I can (can't do much about the HD) made no difference nor did pressing the cuda button nor did removing the PRAM battery for a while.
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Hello Mart,
please review the keyboard plug, these pins bent very easily.
There are occasions when a direct-connect keyboard can help,
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STOP-A is basically a BREAK (use ALT+B in TeraTerm Pro to generate this signal).
During POST the LEDs of the direct-attached keyboard show the current status of POST.
and there are times when it is best to remove it and go with
the console connection, off the TTYa port.
The early phase of POST is only visible on the console (serial, RSC, LOM, ALOM), because the display adapter (integrated or add-in board) isn't initialized yet.
If a monitor doesn't support the current display mode, the monitor doesn't sync and the ability to change the mode via serial console is very valuable.
Sometimes reverting to the default OBP settings is required. Either use STOP-N with a direct attached keyboard or BREAK via console and then
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reset-all
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Hello, I have a early 2008 Mac Pro and it won't boot even with SL DVD

My Mac Pro (3.0GHz quad core (dual CPUs) 8GB 667 RAM) won't boot. it gets to the grey screen/ Apple logo and hangs on the logo for a few seconds then flashes either the question mark folder icon or on the circle-slash icon () for about half a second then the logo for a few seconds and repeats. It will go into Target Disk Mode (T) but not Diagnostic Mode (D)
Here's what I have done to try to fix it:
unplugged all peripherals
tried to force DVD boot holding C (checked disc for errors on SL iMac)
removed all HDDs and rebooted holding C, plus a combination of having some in/ some out.
removed first DVD-ROM and used second drive
removed second DVD-ROM and used first drive
held shift during startup
held option during startup
removed graphics card
put HDDs back in with GFX card out, plus combinations
put only the boot drive HDD in (not time machine or 3rd HDD)
put blank HDD in and booted DVD
put mac formatted (used iMac to format) HDD in and booted with DVD
used an G4 USB keyboard again for all of the above
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Go to System Profile and look, does it say "MacPro3,1"?
That is 2008.
FBDIMM would be 800MHz. Did you use older slower 667MHz in yours?
You can but take a hit in performance.
Sounds like MacPro1,1.
Mac Pro (3.0GHz quad core (dual CPUs) 8GB 667 RAM)
In 2007 March an 8-core 3GHz did come out 2,1.
So just to be clear.
===========
It was all working fine a couple of days ago. At the time it randomly shut down I was trying to use Boot Camp to create a Windows 7 area,
Whenever you want to install Windows, remove all the drives other than the one Windows goes to. And if you use a dedicated drive YOU DO NOT NEED Boot Camp Assist, unless you use XP, which really is limited and crippled (one processor, 1.9GB RAM support).
And when it freezes, your only choice is to nuke (reformat) and restore or get out that backup CLONE you made before (ie, Step #1 in the Boot Camp Guide).
Sure that whole NTFS / MBR / GUID could be an issue, but you should just have a blank drive or clone.
No don't bother Apple, they seem to not have a good sense about Windows on Mac Pro anyway.
Other than zap pram from cold boot / tried booting with NO drives inside and just 10.6. DVD - should be fine.
You should be fine iwth Windows 7 DVD and one drive, or even XP.
Make sure you take your time and reconnect cards etc properly and any cables.
Booting from OS X DVDs may not work if there is a drive with a totally shot directory or partition table. Put them in FW case and turn on AFTER OS X is booted.
Why aren't people Cloning as a Backup Strategy
Carbon Copy Cloner 3.4.2
How To clone

Power mac g5--won't boot, and I can't sleep

Hi all,
I'm hoping someone is awake and can help. My power mac g5, circa 2005, has always come with some problems, specifically, kernal panics. It's not bad RAM, but I have never tested the video card. Oddly enough, it seems to go down most often in the most in simple internet applications.
Today, it froze in Firefox and I cannot get it to reboot. It stalls/freezes in the gray apple screen. Called my IT friend, and he said to zap the PRAM. That brought it back up for a second, and then it froze again. I replaced the battery, no results.
I can't get it to boot in safe mode or even single-user- it freezes up as well. I certainly can't get it up long enough to load the boot disk.
It may be garbage...I can accept that...but it is holding hours of work. Will I be able to retrieve this??
Help
Message was edited by: nigelsupercat

Hi, I'm having same problem. G5 1.8 dual processor purchased March '05, won't boot. Not from cd either.
Took it to the apple geniuses and first was told it might be a bad board or processor and that I might as well just buy a new system. Well, I can't, because I still need to run some classic applications for business reasons, and because of that I'm stuck at Mac OS X 10.3.9. Anyway... I left my system with the apple geniuses and got a call 3 days later saying it was fixed @ no charge and that the 3rd party USB card was bad. They pulled it and said all was well.Great!, saving me $800 charge for a new board and over $430 for a new processor. So on the way home I buy a new USB hub get home start up and nothing! No change. Back to the Apple Store and after some testing this time I'm told it's definitely a bad hard drive. So, on the way home I buy a new hard drive. Get back, install the new HD and, you guessed it, can't format the disk, system won't boot from CD. BACK TO THE APPLE GENIUSES AGAIN! Now they tell me it's definitely the logic board. After 5 days I'm back where I started... except I have an old USB card that is most likely fine and new USB hub and a new HD I purchased because the Apple Geniuses told me they were bad! I asked them if they would apply a credit of some sort for the unnecessary purchases and my time (The closest Apple Store is 30 miles away), They politely said we appologize for the inconvenience, but no, we can't do that. I've been using Macs of all kinds since the early 1980's. And have never had one fail! Since I started looking into G5 problems, I've found many others with this startup issue. I feel there is a known issue with this series that apple is intentionally sweeping under the rug instead of issuing a recall or credit.

Need Methods for Testing Hardware -- Dual 2.0 GHz Won't Boot

Have a Dual 2.0GHz Power Mac (M9032LL/A) that won't boot.... I'd like to know how hardware is diagnosed on these machines? I hear the Apple Hardware Test CD isn't that accurate and not really any help and there's no LED lights on the logicboard of these models, so, short of swapping stuff out, how do I tell what's bad? I'm assuming either a processor, the logic board, or maybe the video card are bad and would like to verify what may be wrong.
The computer doesn't boot reliably but once it is on, it works great. When the power button is pressed, there's no chime, but it makes the other usual appropriate noises, such as the fans and hard drive briefly kicking up and back down... then no more progress. The mouse never lights up (it's optical and flashes when the computer starts up normally), no video ever shows, and the computer just sounds like it's sitting idle-- the fans are slightly on, but the hard drive makes no noise. After several minutes, the fans begin to go into overdrive (the wind-tunnel sound) and I just have to shut it off with the power button.
This problem has become increasingly more bothersome over time-- it used to happen only occasionally. Now the computer won't start on its own at all. Booting into open firmware has tricked it into booting, but has become less and less reliable (described below).
+For those that may be able to help further than recommending hardware testing methods, here's specifics on my situation:+
Troubleshooting I've done:
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In the past I have successfully booted it by booting into open firmware, then typed 'mac-boot' and the computer starts up and works completely fine. It's not flakey, doesn't crash, etc. However, it won't reliably boot into open firmware!
I've also successfully booted into single-user mode. Both in this mode and in open firmware, the fans will go into wind-tunnel mode after about the several minutes as it does when booting via power button alone. However, the command line is still responsive, and a boot command stops the wind-tunnel noise as the computer then boots.
I'd really like to rescue this computer, it's such a speedy, reliable machine that's given me years of excellent performance. If it's time to let it go, I'd like to know for sure, so a way to test the hardware, especially the logicboard and processors, would be nice...
Many thanks for any help,
Selena M.

To those that offered help, thanks, I appreciate it and ended up finding the problem using the most basic hardware test of all-- remove one of the parts on the suspect list, so long as the computer can run with out it, and see what happens, and that resolved my issue!
To those having the same problem-- I found a fix for my machine and it's working great!!! The primary suspects were: logic board, RAM, CPUS or video card. If it was the logic board or a CPU, I'd just call it a parts machine, so tried removing the other parts to see what happened. Still crashed/didn't boot without the third party RAM, and also no difference without the Apple RAM.... but when I removed the video card and hit the power button-- there was that startup chime I hadn't heard in so long!!!!! The machine booted immediately and responded properly to the keyboard's volume and eject buttons. Since I couldn't attach a monitor, I accessed it over the network and it was working fine. I shut down and booted several more times, and it came on every time. So, if those of you that are having the same problems haven't tried this, see if your computer boots without the video card...
*Best of all*, the new video card was free! Apparently the card in my machine has known issues and they'll replace it for free if you send them your old one AND mention this article: http://docs.info.apple.com/article.html?artnum=32473. Read through it, and if your video card matches that model number they list, call the phone number they provide. Make sure you mention the article number, which is 32473, so they can reference it and so they won't charge you an over the phone tech support fee (because this is for a recall). They'll look the article up, ask you what you did and so on. Tell them you tried everything the article suggested and that your computer behaves as the article describes, and they'll send a new card.
Also, note that I'd seen this article before when trying to solve my booting issue, but my computer didn't behave exactly like they described, so I just kinda blew it off. But later, while skimming various forums for answers, I read a post from someone with similar booting problem to mine and he offered the above tip and article number. It's a good thing too, as it saved me the cost of a video card! Otherwise, I just would have bought a new one.
Anyways, I hope this can help one of you out that are having similar problems... just remove that video card (if you haven't already) and see if your computer works. If so, get a new one for free from Apple and hopefully you'll have your computer back!
Good luck!

G4 MDD 1.25 Dual won't boot unless door is left open.

G4 MDD 1.25 Dual won't boot unless door is left open.
If you shut the door, the power switch light turns off and the computer freezes. I'm running a house fan over the board to keep it cool. It's not running hot, was not running hot.
Reset PMU, checked all cables for pinching, inspected the power switch cable, reseated power plug on main board, removed optical drive,
tested ram...
Otherwise the machine is rock solid. I'm stumped, but thinking power supply......
G4 MDD 1.25 Dual Mac OS X (10.4.9)

Had the exact same problem myself. After looking at this topic I noticed that one of the 5V cables was getting jammed in the bottom left hand corner of the door. The case had cut the insulation open and was obviously causing short circuit when the case closed. I put some tape around the damaged cable and tucked it inside the case. Problem solved!

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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Dual 1.25 G4 won't boot OS X anymore, boots linux and hardware test

Dual 1.25 MDD G4 that I've had for 5 years. 1.25 G RAM, 300 Gb HD.
No hardware changes to this machine for several years. Recently it locked up
and I rebooted it - I get a light gray screen with an Apple logo and nothing else
happens.
I cannot boot OS X from CD/DVD, but I can boot the hardware test and run all the tests (all of them pass). I can also boot from a Linux CD.
I've tried various startup key combinations (cmd-opt-P-R, cmd-opt-N-V, etc.) but
I still cannot boot into OS X from either CD/DVD or from the HD.
I tried Techtool deluxe (from old Applecare) and that won't boot the machine since it too is OS X.
Any ideas on what to try next?
Thanks,
-Mark

Dual 1.25 MDD G4 that I've had for 5 years. 1.25 G RAM, 300 Gb HD.
No hardware changes to this machine for several years. Recently it locked up
and I rebooted it - I get a light gray screen with an Apple logo and nothing else
happens.
I cannot boot OS X from CD/DVD, but I can boot the hardware test and run all the tests (all of them pass). I can also boot from a Linux CD.
I've tried various startup key combinations (cmd-opt-P-R, cmd-opt-N-V, etc.) but
I still cannot boot into OS X from either CD/DVD or from the HD.
I tried Techtool deluxe (from old Applecare) and that won't boot the machine since it too is OS X.
Any ideas on what to try next?
Thanks,
-Mark

Dual 2.5 cooling issue: Won't boot.

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