IMacG5 only works laying down????

This has me confused and any suggestions would be appreciated.
I have been running my iMac G5 for about three years on OS X10.3, and haven't had much problems other than an occassional freeze here and there.
Then I made the decision to upgrade to Leopard. I thought it would be great to use all the features and such, so I bought the OS and went through the upgrade.
The upgrade seemed to work ok, but after about a week of running Leopard, my system started behaving really erratically. Freezing up, screen not waking up, several "You must shut down your computer" messages.
I thought, hmmm, better run the Apple Diagnostic disk. Did that, with the long test, and system was given clean bill of health.
Then I thought, maybe I'll upgrade the memory, so I installed 2 Gig of RAM. Booted up, did the diagnostic test again, and all was fine.
Then things got really weird. Every start was difficult and couldn't maintain a stable OS for more than a few minutes of operation.
I decided to do a complete wipe and reinstall of Leopard. Erased the disk, installed Leopard. Still had the problems.
I am not sure when I decided to try this (I think I was just lazy and had opened the back to re-seat the memory and just didn't feel like putting the computer back in an upright position), but I let the system start up while it was lying down on it's back.
Magic! The OS started booting up properly again. I am now running Apple Diagnostic Disk again, this time while the machine is lying down. Before this, I did run the Disk Utility, and did a "verify disk" - at which point it gave several lines of error and said it could not verify.
My question is (while I listen to the airplane engine of the iMac's internal fans drown out all noise in my house), does this point to a Hard Drive error (like the disk is somehow not working in a vertical position and does when in a horizontal) or more some sort of electrical contact on the system board? Everything seems to pass (it's still going now checking the memory) with the diagnostic.
Anybody seen anything like this and have any help?
Thanks!

Thanks Miriam, looks like the segate was able to boot up OSX10.3.6 (installed with original iMacG5 disks) and upgraded to 10.3.9. But now the iMac is extremely erratic in booting up (sometimes it goes light on and blank screen with apple chime, sometimes it will go to the apple image and the rolling timer, but go no further). Probably 1/10 boots results in getting to OSX screen. I've tried resetting PRAM and SMU(?) and reset the memory in their slots, but it just doesn't seem to help. I think I'm going to give up and get another mac - lucky to have the TM backup for restoring to the new one, but kind of disappointed in having a hardware failure kill off this Mac (I've had a couple of macs fail over the years, but this one was unusual because I still couldn't locate the exact problem).

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