G5 Power Mac won't make it through boot sequence, red "LED #1" on w/o power

Recently I bought a new LCD monitor to replace my big ol' CRT. The other day I brought it home and plugged it in. I thought I'd leave the CRT plugged in while I was at it to see if the video card would support both monitors. I'm hoping that the following is coincidental...
My G5 has not made it through the boot sequence since. The computer starts > moves through the white rotating apple "clock" > transitions to the blue progress "Mac OS X is starting..." window and freezes there. Once when doing an NVRAM reset it made it to the login window, but no mouse/keyboard response. Then, regardless of how far it gets, all the fans start running at full speed and it sounds like I'm at the airport behind a 747.
The worst news is that "LED #1" is on at all times regardless of whether the computer is on or off. The support site says to take it to a repair shop. I'm wondering a couple things:
1. Has anyone been able to fix this issue w/o taking it to a repair shop?
2. Has anyone had this issue and have an idea of what I'm up against w/o an ACPP?
Thanks for any help at all!

Thank you for the suggestions. I tried everything and then had to put up the white flag. The only thing I could do was to run fsck and find I had a good disk.
Took it to the local Apple dudes (Haddock Computers - great guys) and they isolated the power supply as the issue, and... determined that there is a replacement program for them. Posting with the machine now, good times.
Thanks again

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One of the dimm modules may be your problem. Turn your power off and eject two of the dimms and leave one seated. You don't have to take the two that are ejected out of the ejector tabs, just make sure they are not seated in the socket in the locked postition. Power up and listen for startup chime. If you get a chime, power down. Push down one of the ejected dimms and make sure it's seated.You'll now have two dimm's engaged. Power up and listen for chime. If you get one, go through the routine again powering down and trying it out with all dimms seated. Depending on which dimm is bad,you'll get no chime if it is seated. If you get no chime when any dimm seated, then you have something seriously wrong with your motherboard or you have something hanging out of the buss when it should be in (for example, an AGP card loose in its socket).

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Make sure you disconnect all peripherals, even the keyboard and mouse (but leave the display connected), when you press the power button. I've had a faulty USB device that interfered with startup before.
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Ok trying this again. Thank you in advance for any help. My dual 2 gig proc power Mac froze during a movie. I shut it down restarted it but it hangs at the apple logo and the fans slowly build speed until it sounds like the box is take off for flight
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See if you can get it to run long enough to get/install some of these...
Get Temperature Monitor to see if it's heat related...
http://www.macupdate.com/info.php/id/12381/temperature-monitor
iStat Menus...
http://bjango.com/mac/istatmenus/
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Hi:
Back again. I tried the OSX install disk and its startup disk menu option. However, since I had the install disk in the Superdrive I could swap it out to see if the Norton CD would be recognized. I was glad to find out that the Superdrive will recognize a startup or boot disk, i.e., OSX install disk. So, it's not the Superdrive. There's nothing wrong with my system...I just wanted to try to use Norton file recovery to retrieve some Mail messages I deleted by accident. I know there is a problem with Norton and 10.4.x. I'm looking at replacing it with either Tech Tools Pro, Drive Genius or just using Apple Disk Utility, Onyx and iPartition and iDefrag. If you think of anything esle, please let me know. Thanks for your time. I love my Dual...your're going to love the Quad! Cheers!

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Texas Mac Man wrote:
It still could be the battery. You need to test the voltage while installed or under some type of load.
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TenFourFox is the most up to date browser for our PPCs, they even have G4 & G5 optimized versions...
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http://code.google.com/p/tenfourfox/downloads/list
SeaMonkey seems pretty fast also, with many options...
http://www.seamonkey-project.org/
http://www.seamonkey-project.org/releases/
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CMD-OPT-P-R
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Power Mac G4: Display Compatibility...
http://support.apple.com/kb/HT1825
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Hi, Folks! I've had this Mac Pro 2.8GHz since 2008 and rarely had a problem. Last night, the clock was wrong (for the first time ever); it said it was a few hours later than it was. And I couldn't reset it in System Preferences. I re-booted and the cycle began:
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Interval Since Last Panic Report: 6359529 sec
Panics Since Last Report: 5
Anonymous UUID: 4CB87D56-DA4B-4815-8FB1-DD0E8BA6EA61
Wed Aug 8 14:45:07 2012
panic(cpu 10 caller 0xffffff80002b7b95): Kernel trap at 0xffffff7f822faffc, type 14=page fault, registers:
CR0: 0x000000008001003b, CR2: 0x000000000000001c, CR3: 0x000000000bf3c025, CR4: 0x00000000000206e0
RAX: 0xffffff8008cb1b04, RBX: 0x0000000000000000, RCX: 0x0000000000000000, RDX: 0x0000000000000000
RSP: 0xffffff81b697b0b0, RBP: 0xffffff81b697b1f0, RSI: 0x0000000000000000, RDI: 0x0000000000000000
R8: 0x0000000000000000, R9: 0xffffff81b697b3c0, R10: 0xffffff7f822faf50, R11: 0x0000000000800000
R12: 0x0000000000000000, R13: 0x0000000000000001, R14: 0xffffff8008cf0204, R15: 0xffffff8008314004
RFL: 0x0000000000010246, RIP: 0xffffff7f822faffc, CS: 0x0000000000000008, SS: 0x0000000000000010
Fault CR2: 0x000000000000001c, Error code: 0x0000000000000000, Fault CPU: 0xa
Backtrace (CPU 10), Frame : Return Address
0xffffff81b697ad50 : 0xffffff800021d5f6
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Hello, could you be mistaken???
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