Power Mac g4 freezes up when put in sleep mode

Hello. So the machine has had a lot of changes but the problem just started a couple days ago, before that I was going into sleep mode just fine with no problems. The problem is when the computer goes to sleep it freezes, the screen goes black but the fan and hard drive are still going and the light never turns to the flashing amber. What's more I'm unable to wake it up or use the keyboard restart command. The only way to restart or shutdown are the buttons on the tower. So I've turned power saver off and now have just resorted to shutting down when it's not in use but that's pretty bad in the long run.
Any ideas on what may have started causing this? Like I said it's beem working perfectly for a while now.
Here's info on the machine
I'm running a modified AGP G4 stats as follows:
Machine Name: Power Mac G4 (AGP graphics)
Machine Model: PowerMac3,1
CPU Type: PowerPC G4 (3.3) (Power Logix dual 1.3)
Number Of CPUs: 2
CPU Speed: 1.3 GHz
L2 Cache (per CPU): 256 KB
L3 Cache (per CPU): 2 MB
Memory: 1.75 GB
Bus Speed: 100 MHz
Boot ROM Version: 4.2.8f1
System Version: Mac OS X 10.4.9 (8P135)
Kernel Version: Darwin 8.9.0
Classic 9.2.2
ATI Radeon 9200:
Chipset Model: ATY,RV280
Type: Display
Bus: AGP
Slot: SLOT-A
VRAM (Total): 128 MB
Vendor: ATI (0x1002)
Device ID: 0x5960
Revision ID: 0x0001
ROM Revision: 113-A27502-124
Displays:
SyncMaster:
Resolution: 1440 x 900 @ 60 Hz
Depth: 32-bit Color
Core Image: Not Supported
Main Display: Yes
Mirror: Off
Online: Yes
Quartz Extreme: Supported
Display:
Status: No display connected
ATA ST3200822A:
Capacity: 186.31 GB
Manufacturer: ATA
Model: ST3200822A
Revision:
Removable Media: Yes
BSD Name: disk2
OS9 Drivers: Yes
SCSI Target Identifier: 1
SCSI Logical Unit Identifier: 0
S.M.A.R.T. status: Not Supported
I also have a 60 gig HD installed which is currently not being used
Thanks again in advance.
Aaron

Did you install a USB 2.0 PCI card and do you leave bus-powered devices connected to it, when the computer goes into sleep mode? There have been many reported sleep issues associated with USB 2.0 cards in the G4s. What name is printed on the main controller chip (sometimes it's hidden by the card manufacturer's label)? The consensus of opinion is that USB 2.0 cards with an NEC chip tend to have fewer problems. Additionally, it's a good practice to disconnect the bus-powered devices from the card, prior to letting the computer go into sleep mode.

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Boyd Porter wrote:
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Shuts down when put into sleep mode

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When my ipod touch locks itself or if I put it into sleep mode, it will not wake itself up with the press of a button - instead, it restarts (black screen with apple logo in centre).
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Message was edited by: Agent-Trig

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Computer works fine but when I put it in "sleep" mode in shuts down and cannot be restarted without unplugging and starting over. Once started it works fine again until the next "sleep".
Anything I can try before backing everything up and heading for the Apple store ?

Disconnect all devices except for the keyboard & mouse if you have not done so.
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Lock the padlock.
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==============
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Make it easier for other people to find solutions by marking a Reply 'Accept as Solution' if it solves your problem.

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Before you have another accident:
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At this point I think you should get Applejack...
At this point I think you should get Applejack...
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After installing, reboot holding down CMD+s, (+s), then when the DOS like prompt shows, type in...
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Repair Permissions.
Clear out Cache Files.
Repair/check several plist files.
Dump the VM files for a fresh start.
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I am not sure if it started when I installed OSX tiger or when I added two new ram memory chips (I have four added, 2 512 SDRAMM and 2 128 SDRAMM).
The absolute first step in troubleshooting is to remove the recently added RAM.
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Have you tried a Safe Mode boot (hold Shift while booting)?
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If after removing the RAM, and after Safe mode, the problem persists, a PMU reset may be worth trying.
The PMU controls all power functions, sleep and shut down and start. Corruption in the PMU will cause problems with these functions, and a reset will clear this up if the PMU is the root cause.
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In spite of the fact that you said you checked the settings, I still believe that you have system sounds muted.
System sounds can be muted and controlled two different ways. The screen lock rotation can be controlled in the same manner as well.
Settings>General>Use Side Switch to: Mute System sounds. If this option is selected, the switch on the side of the iPad above the volume rocker will mute system sounds.
If you choose Lock Screen Rotation, then the switch locks the screen. If the screen is locked, you will see a lock icon in the upper right corner next to the battery indicator gauge.
If you have the side switch set to lock screen rotation then the system sound control is in the control center if you are running iOS 7. Swipe up from the bottom of the screen to get to control center . Tap on the bell icon and system sounds will return.
If you have the side switch set to mute system sounds, then the screen lock can be accessed in the same manner as described above.
This support article from Apple explains how the side switch works.
http://support.apple.com/kb/HT4085
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HT1436 My Power Mac G5 will not fully boot without safe mode, it only comes to a blue screen where my cursor duplicates in to 2, (one is frozen, one can move by moving the mouse). What is my problem, and how do I fix it?

My Power Mac G5 will not fully boot without safe mode, it only comes to a blue screen where my cursor duplicates in to 2, (one is frozen, one can move by moving the mouse). What is my problem, and how do I fix it?

Great clue Lukas...
One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for problem in Safe Mode...
PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive
Reboot, test again.
If it only does it in Regular Boot, then it could be some hardware problem like Video card, (Quartz is turned off in Safe Mode), or Airport, or some USB or Firewire device, or 3rd party add-on, Check System Preferences>Accounts>Login Items window to see if it or something relevant is listed.
Check the System Preferences>Other Row, for 3rd party Pref Panes.
Also look in these if they exist, some are invisible...
/private/var/run/StartupItems
/Library/StartupItems
/System/Library/StartupItems
/System/Library/LaunchDaemons
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Power Mac g4 freezes up when put in sleep mode

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