Power Mac G5 DP 1.8, won't to enter in Open Firmware, and no OF comm. exec.

Hi Guys,
It seems to strange but my Power Mac G5 DP 1.8 Ghz, cannot enter in the OF and no commands are accepted by the OF (like boot from cd pressing C, or reset Pram, or everything else)
I'm not sure but probably after the last upgrade ( november 2004 if i remember well) but i'm not sure.
i try all this things:
1) reset SMU by disconnect the power cord for 15 minutes
2) change the Keyboard
3) delete the Password for OF (but didn't sets up)
4) i use the cd with the Apple test, but all is reported as good
The problem is affecting also the sleep mode, when my Mac go to sleep there're no way to wake up !!!, i can only force the power off.
HELP !!!
I'm alone with this problem on G5 DP 1.8 ??
I see many post regarding problem on G5, but i see only on a SP 1.8 !!!
Anyone have idea ?
thx
Fabio

Sorry, i miss some info,
when you press the key on the keyboard nothing happen, and one thing strange are 3 "stock" of noising sound immediately after the white screen with the apple appear on the screen.
After the boot everythings are good, the system is stable, is fast,and the sound is nice.
Nothing could thing to a problem, if i wont to start with another disk or from a cd, the only way is to chose it from the system preferences.
Also the sound volume is "saved" in the pram,so if i shutdown the Mac with no sound, when the mac start the sound is at level 0, so the pram is working good.

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OOPs, you marked it answered/Solved, might repst to get more helpers looking at it.
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ETRECHECK:
(I'm only posting part of this-- I don't know if there's a posting limit or protocol on posting). I am running CS5
Hardware Information: ℹ️
Mac Pro (Verified)
Mac Pro - model: MacPro1,1
2 2.66 GHz Dual-Core Intel Xeon CPU: 4-core
6 GB RAM
DIMM Riser A/DIMM 1
2 GB DDR2 FB-DIMM 667 MHz ok
DIMM Riser A/DIMM 2
2 GB DDR2 FB-DIMM 667 MHz ok
DIMM Riser B/DIMM 1
512 MB DDR2 FB-DIMM 667 MHz ok
DIMM Riser B/DIMM 2
512 MB DDR2 FB-DIMM 667 MHz ok
DIMM Riser A/DIMM 3
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DIMM Riser A/DIMM 4
512 MB DDR2 FB-DIMM 667 MHz ok
DIMM Riser B/DIMM 3
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DIMM Riser B/DIMM 4
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ATY,RadeonX1900 - VRAM: 512 MB
VX2336 SERIES 1920 x 1080 @ 60 Hz
hp f1703 1280 x 960 @ 75 Hz
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- (disk2s1) <not mounted> : 210 MB
500GB (disk2s2) /Volumes/500GB : 499.76 GB (92.11 GB free)
WDC WD1002FAEX-00Z3A0 disk1 : (931.51 GB)
- (disk1s1) <not mounted> : 210 MB
1TB Drive (disk1s2) /Volumes/1TB Drive : 999.86 GB (760.73 GB free)

Power Mac G5 DP 1.8, won't to enter in Open Firmware, and no OF comm. exec.

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