Restart dialog box on grey screen

Every morning I start up my eMac 1GHz G4 and run OnyX maintenance items.
About half way through this ap or the next one I open I get a grey film on top of what I have opened on my desktop and a large dialog box asking me in 5 languages to restart my computer by holding down the power button for a few seconds.
eMac 1GHz PowerPC G4 Mac OS X (10.4.8)

You're describing a kernel panic. Those can be caused by a number of things: bad RAM, hardware faults in attached peripherals, incompatible drivers, or bad/incorrect software.
There's no reason to run OnyX (or any similar utility program) on a daily basis. If your Mac is normally shut down overnight, running the cron maintenance routines manually bimonthly or so is actually sufficient, weekly is you want to be throrough (the weekly cron task is the lenghiest one). Are you using the Tiger 10.4 version of OnyX? Are you running only the maintenance scripts via OnyX (OnxX is a great program that does a lot of things, like a Swiss Army knife, but like any knife it can cut you if used incorrectly). More directly, does the Mac run normally if you don't run OnyX after starting? An older/incompatible version of a disk utility program can cause problems (see Only use Mac OS X 10.4-compatible disk utilities with Mac OS X 10.4 volumes). You may want to manually force background maintenance weekly or bimonthly instead.
General kernel panic advive: to narrow down the cause of the kernel panic, first disconnect all peripherals other than the Apple keyboard and mouse. I'd recommend then booting from your Tiger OS X Install disc to run Repair Disk on the hard drive, as described in Using Disk Utility and fsck. Take note of any errors reported and if repairs are made, repeat Repair Disk (one error can mask others) until you either get a "no repairs needed" message or it becomes obvious that Repair Disk is stuck in a loop.
Then Start Up in Safe Mode. Be aware that it takes longer than usual to start in Safe Mode as the Mac performs faceless checks on the drive. If the computer fails to start in Safe Mode, that would suggest an issue with the Mac's hardware; use the Apple Hardware Test disc that came with your eMac to check the computer (the AHT disc may be a separate CD or a partition on the original OS X Install/Restore DVD that you can boot to using Startup Manager.
Assuming the Mac starts OK after booting in Safe Mode, use Disk Utility to run Repair Permissions. The, leaving the peripherals disconnected, try a normal startup. After than, add your peripherals back one at a time, checking for problems after each.

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On Wed, 14 Dec 2011 20:51:03 +0000, Nootrino wrote:
>
>
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