Monitor will not awaken from sleep

PowerMac G4 Dual 1GHz Quicksilver. OS 10.5.2, Apple Cinema Display. After sleeping, monitor will not awaken. Display is visible when screen sharing from another computer. Requires restart.
Recent changes:
Started using Time Machine on an existing internal drive.
Installed a Time Capsule Airport Base Station in the house.
Started using the built in Screen Sharing software.
Upgraded to 10.5.2.

Here's the basic steps , including checking the parameters.   My all time favorite,  using reverse logic (sometimes).
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(2) HP DV7t i7 3160QM 2.3Ghz 8GB
HP m9200t E8400,Win7 Pro 32 bit. 4GB RAM, ASUS 550Ti 2GB, Rosewill 630W. 1T HD SATA 3Gb/s
Custom Asus P8P67, I7-2600k, 16GB RAM, WIN7 Pro 64bit, EVGA GTX660 2GB, 750W OCZ, 1T HD SATA 6Gb/s
Custom Asus P8Z77, I7-3770k, 16GB RAM, WIN7 Pro 64bit, EVGA GTX670 2GB, 750W OCZ, 1T HD SATA 6Gb/s
Both Customs use Rosewill Blackhawk case.
Printer -- HP OfficeJet Pro 8600 Plus

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