Wont boot,no chime,one blink on staus led,on 2.ghz rev.A

hi everybody
i have problems with my g5 2.0 rev.A,
first i turn the computer on,no chime no video,no boot also and the status blink one time sequence,try few times and start boot ok,a couple days ago,same thing happen again, i try 3 times to boot the machine the 4 time came up,then i check the hardrive,i ran disk utility and got 4 bad blocks on the hard drive,so i use tech tool to fixed,,work ok,,,then few days ago i boot the machine everthing is ok,then i let the machine on becuase i was downloading a file and let the machine on all night,when i wake up,i hear the fans full baststing and the blinking led status one time sequence,the keyboard wasnt responding,no mouse ,no video,so i trun off the computer,then i turn the computer back on..i wont boot...the light blink one time,it dosent blink 2 or 3 or 4 or 5 time in sequence,just blink one time...i guest is the hardrive maybe my factory hardrive just die...i need help on these situation..any help i would appreciated.thanks
g5 2.0 power mac,powerbook 1ghz,g4 450 mhz Mac OS X (10.4.8)

Hi rafael, and a Warm Welcome to the Power Mac G5 Forum!
Whilst not wishing to give you false hope, a similar 'one flash' problem was fixed by experimenting with the RAM here
http://discussions.apple.com/message.jspa?messageID=3338765#3338765
So, you could try taking out any added RAM and see if it will boot with just the original "Apple" RAM. If it does, you could try replacing the added RAM, in pairs, and try it.
If it won't boot with just the original RAM, you could try removing and then replacing it - sometimes it's just a bad contact in the slot. This might be the problem with the added RAM too, rather than the RAM being faulty. The RAM DIY instructions are here
http://www.info.apple.com/usen/cip/pdf/g5/memory_c.pdf
Note especially the static precautions.
Once you get it to boot ok, you could run the Apple Hardware Test
http://www.thexlab.com/faqs/aht.html
esp. noting the links to Memtest/Rember further down the page.
As it had a forced shutdown, you could run Disk Utility (the one on the 10.4.8 drive) and Repair Permissions and Verify Disk.
Good Luck.

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