Slow Boot (blue screen) & Sleep mode doesn't works!!!!!

Hello,
I have a problem with my Powerbook G4; when i connect the G4 with another G4 via firewire, one of this Powerbooks shutdown unexpectly and wont boot again...
i had to make a fesh install of Mac OS X Leopard (again), to try solve this issue; after this the boot is extremely slow and stays in blue screen by around 5 minutes.
another problem is the sleep mode, when i try to turn to sleep mode the screen turns in black ..
Powerbook G4 info:
model--> Powerbook G4 15"
processor -->PowerPC G4 1.5ghz
Ram--> 768mb
Boot Rom Version--> 4.8.4f1

Have you tried to reset the PMU?
http://support.apple.com/kb/HT1431

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I have two questions:
Actually I count three questions.
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2) Can I somehow have that auto-logon progress bar back?
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Kappy's Personal Suggestions for OS X Maintenance
For disk repairs use Disk Utility. For situations DU cannot handle the best third-party utilities are: Disk Warrior; DW only fixes problems with the disk directory, but most disk problems are caused by directory corruption; Disk Warrior 4.0 is now Intel Mac compatible. TechTool Pro provides additional repair options including file repair and recovery, system diagnostics, and disk defragmentation. TechTool Pro 4.6.1 is Leopard compatible; Drive Genius is similar to TechTool Pro in terms of the various repair services provided. The current version, 1.5.1, is Intel Mac compatible.
OS X performs certain maintenance functions that are scheduled to occur on a daily, weekly, or monthly period. The maintenance scripts run in the early AM only if the computer is turned on 24/7 (no sleep.) If this isn't the case, then an excellent solution is to download and install a shareware utility such as Macaroni, JAW PseudoAnacron, or Anacron that will automate the maintenance activity regardless of whether the computer is turned off or asleep.
OS X automatically defrags files less than 20 MBs in size, so unless you have a disk full of very large files there's little need for defragmenting the hard drive. As for virus protection there are few if any such animals affecting OS X. You can protect the computer easily using the freeware Open Source virus protection software ClamXAV. Personally I would avoid most commercial anti-virus software because of their potential for causing problems.
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2. Synchronize! Pro X (Commercial)
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Visit The XLab FAQs and read the FAQs on maintenance, optimization, virus protection, and backup and restore.
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