G5 Starts Up Fine But Doesn't Start Monitor Consistently! I'm stumped!

Hello all. I just purchased a new Mac Pro. My G5 has been problematic for a number of months now even under Leopard. I replaced the internal battery, have done PMU and zapped PRAM and nothing solved my problem. The problem has been: It takes me at least 2 pushes of the power button but sometimes 3 or more to get video on my 20" Cinema Display. This only happens at the start of the day.
Upon receiving the Mac Pro, I zeroed out the G5 hard drive in preparation for sale on eBay but I wanted to make sure that it would start consistently for the new owner. That is the only problem I've ever had with the G5. I then installed Tiger and all the associated upgrades but zero additional software.
I connected to a Samsung monitor with its own cable. I was gone for the weekend, came home and G5 and monitor started up beautifully first time. Great, I thought. This morning, three fresh starts off the G5 power button started everything up just fine but the monitor did not come on. The computer boots up but the monitor does not come on. After one PRAM zap, up it came just fine. I reseated the two 512MB RAM sticks, pressed the PMU button once and and hoping for better things but I can't figure this out as the computer otherwise runs fine. I thought it might have been a pesky .KEXT file or something but a zeroing of the hard drive and installation of Tiger should have fixed that, true?
Anyway, I want to make sure the new owner will have a trouble-free computer.
Any suggestions on how I might fix this problem, and, indeed what the problem might be? It appears that the monitor cables and the two monitors are fine as they work fine with other computers. I always thought this was some sort of third party issue but with the newly installed Tiger and updates that's eliminated. Might it be a problem with the graphics card?
This one has me stumped!
Thanks in advance!
SNazz123

Quote from: jweb2k on 07-October-09, 05:59:52
Oh right. Those are the ones suggested in the HAF 932 case manual. I've used what I think are:
http://images.devshed.com/dh/stories/Building_System_Scratch/scews.jpg
Or am I wrong?? Thanks for your help!
Yes, those appear to be correct one, but they look different than in your photo.
So does the mainboard can boot fine when its outside PC case?
Before mount the mainboard to the PC case:
Motherboard Grounding to case causing No Post
Test the motherboard outside of the case to verify that the motherboard is not shorting to the case and causing a problem
• With only the CPU and heat sink, memory, and video card (or onboard video) connected to the motherboard, place the motherboard on a non-conductive surface and retest the motherboard
• Check the case mounting standoffs to verify that they are lining up correctly with the mounting holes on the motherboard.

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