Power Mac G4 MDD strange startup problem

Hello ,
I have an old G4 MDD dual 1Ghz which is been used by my 6 years old son  for gaming and watching movies.
I had Tiger 10.4.11 on a IBM deskstar HDD and Leo 10.5.8 on a seagate HD.
Everything was fine until some days ago, when my mac didn't boot from the first try…..black screen.
After a second attempt , booting was just fine.
I have now two system disks (IBM deskstar HDD) with 10.5.8 installed.
Mac is not booting always from first attempt….it takes two more  with or without the option key pressed to choose a startup disk.
I have done all the usual…….reset PMU-PRAM…replacing battery,replacing cables,cable select the drives and now forced one to master and second to slave.
I have run Service Diagnostics 2.1.5………..ALL TESTS PASSED.
Still not booting normally….
Any suggestions please??
Thank you all!
PS:It is also loosing very often internet connection via ethernet……..I think it's not a router problem as all my other macs are working normally.

So, as I understand this only happens on the one drive - the main drive. Are you sure, given what you've described, that the "main drive" is connected to the correct cable connector? Usually, the drive ID is determined by its position on the drive cable. If I remember correctly the main drive is connected to the ribbon cable at the end of the cable while the second drive is connected to the middle connector (for a two drive cable.) Just a thought as it's been a while since I've used non-Intel machines. If this is the case then your slave drive may actually be the main drive and vice-versa.
The other alternative if this always happens on this one drive that the drive itself is failing. Is it possible to replace it as a check?

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