My old mac powerbook g4 wont boot up, it wont show apple logo and spinner aswell just stuck on grey screen while booting please help me

i have a old powerbook g4 which i usally use to store some photos and to listen music. the battery of my powerbook is completly dead so i used to use my powerbook using charger adapter so whenever my power cuts down my laptop will be shutdown.
one day i had just bootedup my powerbook and some date notificateion poped up so i press enter and suddenly my power went off and laptop shuted down. and next time when i tried to boot its stuck at grey screen , i even cant reach the apple logo and spinner. please helppp me :!!!!!!!!!!!!!!!

Resetting PRAM and NVRAM is not working
and i cann't boot it on safemode holding shift button and while holding option or c button at startup i can only see three things 1 is refresh button, 2 macintosh HD with X under it, 3 arrow forward button please help me

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- See if placing the iPod in Recovery mode will allow a restore.
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How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
- Last, make an appointment at the Genius Bar of an Apple store.

Imac wont boot - i get a white screen with apple logo, and it loads to about 10%, then screen goes black

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Hey there mtriest,
It sounds like you are unable to boot the iMac successfully as it keeps shutting down when you try to boot. I suggest the troubleshooting from the following article named:
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/ts2570
Disconnect, test peripheral devices and network cables
Note: "Peripheral devices" refers to external devices other than what came with your Mac, such as hard drives, printers, or hubs that you connect via a USB or FireWire cable.
Shut down your Mac. If necessary, hold your Mac's power button for several seconds to force it to power down.
Disconnect all peripheral devices such as external hard drives or printers (leave only the display, a keyboard, and mouse connected).
Disconnect any Ethernet cables.
Start up your Mac.
If you can start up this way, one or more of your peripheral devices (or installed software related to the device) is probably causing the gray screen issue. Connect one device, then restart your Mac to test for the issue. Repeat the process until you locate the device at issue. Make sure the device is powered if it needs to be to operate correctly. Check with the manufacturer of the device for support or possible software driver or firmware updates that may be available for the device. Try a different cable with the device if possible (such as a different USB or FireWire cable).
Note: If you have multiple peripheral devices and the issue only occurs when they are all connected, but not when each device is the only peripheral connected, see the Additional Information section below.
If you are using a desktop Mac with a third-party keyboard and/or mouse device, and the issue still occurs, try starting up with an Apple keyboard and mouse connected instead. Try starting with no keyboard and mouse connected, then connect them after start up. Also, try a different USB port on your Mac.
If the gray screen issue persists with no devices connected, go to the next section (with the peripherals still disconnected).
Perform a Safe BootSimply performing a Safe Boot may resolve this issue.
Shut down your Mac. If necessary, hold your Mac's power button for several seconds to force it to power down.
Start your Mac, then immediately hold the Shift key. This performs a Safe Boot. Advanced tip: If you want to see the status of a Safe Boot as it progresses, you can hold Shift-Command-V during start up (instead of just Shift).
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If your Mac starts up as expected, immediately try restarting.
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Thank you for using Apple Support Communities.
Cheers,
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My S930 stuck at lenovo screen while boot up.
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HT204347 Hi my serial number on bottom of my mac is W8*******66E when l try to try the computer on it is just going to grey screen with apple logo and spinning wheel i have tried starting in safe mode and a few other suggested solutions and they have not

Hi my serial number on bottom of my mac is W8******66E when l try to turn the computer on it is just going to grey screen with apple logo and spinning wheel i have tried starting in safe mode and a few other suggested solutions and they have not worked?
<Edited by Host>

What other solutions have you tried?
This may help you:
https://discussions.apple.com/docs/DOC-3353
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Steps I tried:
1. Resetting NVRAM, PVRAM and SMC.
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Thanking You.

Hi julenawang,
Welcome to Apple Support Communities.
It sounds like your MacBook has a startup issue and you aren't able to reinstall Mac OS X on a new hard disk. The article linked below has a lot of great information and suggestions that will resolve most issues like the one you described.
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/TS2570
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Error 3194 still presist while restoring ipod touch 4g, just shows apple logo and wont start

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Method 2: redsnow, snowbreeze,ireb (custom ispw and fetching thing)...
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Method 3: TS 3.0 and 1.0 checked, certificate xyz... uncheked from intertnet explorer-> internet option -> advanced -> security
Method 4: netsh xyz (comand) in cmd...
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"Details:
ipod touch 4g
ios 6.1 installed (lastly)
jail broken but deleted cydia from it
then tried to restore it always gave Error 3194,
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Microsoft Windows 7 Business Edition Service Pack 1 (Build 7601)
Hewlett-Packard HP xw4400 Workstation
iTunes 11.1.1.11
QuickTime not available
FairPlay 2.5.16
Apple Application Support 2.3.6
iPod Updater Library 11.1f5
CD Driver 2.2.3.0
CD Driver DLL 2.1.3.1
Apple Mobile Device 7.0.0.117
Apple Mobile Device Driver 1.64.0.0
Bonjour 3.0.0.10 (333.10)
Gracenote SDK 1.9.6.502
Gracenote MusicID 1.9.6.115
Gracenote Submit 1.9.6.143
Gracenote DSP 1.9.6.45
iTunes Serial Number 001AB71808E6CBD8
Current user is not an administrator.
The current local date and time is 2013-11-29 04:19:21.
iTunes is not running in safe mode.
WebKit accelerated compositing is enabled.
HDCP is not supported.
Core Media is supported.
Video Display Information
NVIDIA, NVIDIA GeForce 8400
**** External Plug-ins Information ****
No external plug-ins installed.
iPodService 11.1.1.11 is currently running.
iTunesHelper 11.1.1.11 is currently running.
Apple Mobile Device service 3.3.0.0 is currently running.
**** Network Connectivity Tests ****
Network Adapter Information
Adapter Name:    {BC8F9388-D244-4F12-92A3-A26318EE6C52}
Description:    Broadcom NetXtreme Gigabit Ethernet
IP Address:    192.168.1.102
Subnet Mask:    255.255.255.0
Default Gateway:    192.168.1.1
DHCP Enabled:    Yes
DHCP Server:    192.168.1.1
Lease Obtained:    Fri Nov 29 04:16:55 2013
Lease Expires:    Fri Nov 29 06:16:55 2013
DNS Servers:    192.168.1.1
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Connected:    Yes
Online:        Yes
Using Modem:    No
Using LAN:    Yes
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Connection attempt to browsing iTunes Store was successful.
Connection attempt to purchasing from iTunes Store was successful.
Connection attempt to iPhone activation server was successful.
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lllaass thank u bro, but none worked for me
i have tried all these methods n above which i mentioned before....
- Powering off and then back on your router.
- iTunes for Windows: iTunes cannot contact the iPhone, iPad, or iPod software update server
- Change the DNS to either Google's or Open DNS servers
Public DNS — Google Developers
OpenDNS IP Addresses
- For one user uninstalling/reinstalling iTunes resolved the problem
- Try on another computer/network
- Wait if it is an Apple problem
in the end i went ot market n paid him 1.94$ and he restored it to 6.1.5... and said apple has closed other ios updation except 6.1.5 ...but still thank u soo much learned some new stuff from u...

Updated to Tiger, stuck on grey screen BUT boots fine with option key

I've searched the forum and found many other similar threads. But no real answers for my particular problem. Here it is. iMac 800 MHz G4, 512 RAM was on 10.3.9. Updated to 10.4.5. Then booted from a firewire hard drive and fixed permissions and ran Disk Warrior. Now when I try to boot up normally it just stays on a blank grey screen. No Apple logo. No spinning wheel, nothing. Weird thing is it boots up fine if I hold down the option key at start up and select the hard drive. So, I've done that and repaired permissions and run disk utility. Says everything is OK. Even zapped the PRAM. But still, only way to get it to boot is by holding option key and choosing hard drive. Any ideas?

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As Dr Smoke would say: "Good luck! "
Have fun too!
An  a day...
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