G5 Startup issue - question mark folder

Hello -
I am using a PowerMacG5 Dual 2.3 ghz with 1GB RAM
OS 10.4.9
No partitions or anything - just one large hard drive.
It has started having an issue on startup :
For a second, it shows the Flashing question mark folder, then starts up as normal.
Not sure how long this has been happening, or what triggered it.
It runs fine otherwise, except for not recognizing its Airport card.
Latest Repair Permissions returns only the folllowing :
Repairing permissions for “Macintosh HD”
Determining correct file permissions.
Permissions differ on ./private/var/log/secure.log, should be -rw------- , they are -rw-r-----
Owner and group corrected on ./private/var/log/secure.log
Permissions corrected on ./private/var/log/secure.log
Permissions repair complete
The privileges have been verified or repaired on the selected volume
But I want to avoid this becoming a larger issue - why would it be doing this Question Mark on startup and what can anyone recommend - clean install ? upgrade to 10.4.10 ? other ideas ?
Thanks

Hi infoAP-
It sounds like it may be looking for a startup disk, doesn't find what it is looking for, and resorts back to the system drive.
Take a look at your Startup Disk preference and make sure the drive of this particular mac is selected, unless you want it to boot from something else.
Luck-
-DaddyPaycheck

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