LED blink, no boot

Computer is not booting. Sometimes I get a 2 blink sequence from Caps Lock and Num Lock LED's. Most of the time however, all I get is a continuously blinking Caps Lock LED, then the keyboard dims (flashing LED continues) then about 15-20 secs from start the fan starts. No boot, no display on screen.
Holding down power button doesn't stop it, the only way is to remove battery and disconnect power.
I have tried:
Hard reset.
Clean the fan, and vents.
Remove, clean and reseat memory.
Booting with memory in second slot.
Remove and reinstall hard drive!
Connecting outside monitor.
Nothing has helped.
Any other suggestions/ ideas about possible cause? What does the 2-blink sequence mean on this laptop?
TIA

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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Welcome to Apple Discussions!
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Copyright (c) 1986-2010 by Cisco Systems, Inc.
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Motherboard serial number       : FDO15021WG7
Model revision number           : A0
Motherboard revision number     : A0
Model number                    : WS-C3750X-48PF-S
Daughterboard assembly number   : 800-32727-01
Daughterboard serial number     :
System serial number            :
Top Assembly Part Number        : 800-31324-01
Top Assembly Revision Number    : A0
Version ID                      : V01
CLEI Code Number                : COMJZ00ARA
Hardware Board Revision Number : 0x02
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     2 54    WS-C3750X-48P      12.2(55)SE1           C3750E-IPBASEK9NPE-M
     3 54    WS-C3750X-48P      12.2(55)SE1           C3750E-IPBASEK9NPE-M
     4 54    WS-C3750X-48P      12.2(55)SE1           C3750E-IPBASEK9NPE-M
     5 54    WS-C3750X-48P      12.2(55)SE1           C3750E-IPBASEK9NPE-M
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Check the link below:
Troubleshooting LED Blink Codes or Beep Codes During Startup or Boot
** Say thanks by clicking the "Thumb up" icon which is on the left. **
** Make it easier for other people to find solutions, by marking my answer with "Accept as Solution" if it solves your issue. **

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Hi,
Check the link below:
Troubleshooting LED Blink Codes or Beep Codes During Startup or Boot
** Say thanks by clicking the "Thumb up" icon which is on the left. **
** Make it easier for other people to find solutions, by marking my answer with "Accept as Solution" if it solves your issue. **

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Quote from: Deathstalker on 12-April-05, 00:14:59
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No cisco web is working perfectly.
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i'm ikari from indonesia,
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Hi and Welcome to the Community!
Before you proceed to try and reload your OS, I recommend something a bit less destructive...
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Wait another 2 hours, no matter what the LED or the display does
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Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.
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PIN: C0001B7B4 Display/Scan Bar Code
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http://www.ni.com/support
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Another Blinking LED in Pushbutton.vi ‏8 KB
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As described in the header, my Apple TV (120GB) has its LED blinking amber non-stop, no video, no audio. It is about 2 months old and I have never had issue with it before.

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