Get Startup Chime but no video

I have a Powermac G5 that seems to have died. I turn it on, it chimes, but it has no video and does not boot. All the diagnostic LED's are normal. It does not respond to zapping the PRAM (only chimes upon boot and not again). I have tried 2 different video cards in it. I reset the PMU and checked the battery voltage level which was fine. Any other ideas on what to try or what could possibly be wrong? Thanks

Dual 1.8GHz, Mac OS X (10.5.4)

Posted on Mar 4, 2009 10:07 AM

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10 replies

Mar 4, 2009 4:32 PM in response to japamac

No it doesn't boot to anything. Holding C on the keyboard doesn't do anything, nor does option, or Command-Option-P-R.
It chimes once, with no video (tried several monitors DVI & VGA with adapter), then sits idle for a few minutes and then fans start getting louder until they are full blast. Same thing happens when video card is removed. It should boot or zap pram even without video card.

Apr 25, 2009 8:18 PM in response to Josh Safranek

I'm having a similar problem.

Just purchased a used G5 2.0GHz yesterday and gave it my usual deep cleaning (all fans, chassis, etc).

When I put it back together and tried booting it up, I got the chime and then nothing...

OK, I'll try pushing the PMU button. Same results.

How about a fresh new battery! Nope, still a blank screen and no hard drive noise.

"Hmmm? Maybe I got a lemon?" I think to myself, and walk away.

After thinking about what to do next for about 15 minutes, I came back to "What's this!? A desktop!? Sweet!" Everything is working right, so I set up Date/Time so on and so forth and reboot... Chime and blank screen, but I sit and watch. After about 3 minutes, the machine starts to rev it's fans up faster and faster, then my mouse lights up and the computer starts the usual boot-up.

OK, this is weird. Then it occurs to me that when I set up my display (Dell 17" CRT using a DVI to VGA converter), the computer listed it as a generic VGA Monitor.

How about trying an Open Firmware reset? Viola! After that was done the computer now saw the monitor as the correct brand and model.

Rebooting now was happening with no lag or delay. It's fixed right?

Well, I needed to take the computer to another room to run the software updates so I unplugged it, relocated it, and reconnected it. Chime then blank screen... Come on. This is irritating.

While it was booting I tried cycling the power button on the monitor and it immediately started to boot up.

Looked at the Monitor Preference Pane and it's listed as a VGA Monitor again. Go through another Open Firmware Reset and the monitor is listed correctly with name and model and the computer boots up with no delay.

I am going to try my other primary monitor tonight (Samsung LCD with DVI) to see if this is all happening due to some glitch when the computer doesn't know what kind of monitor is hooked up. Could be something with the DVI to VGA adapter (Apple Brand mind you) or maybe its this old Dell CRT.

For fun, and to possibly save some time for people reading this, I did go through the long full hardware test and everything passed. Weird thing about that was the fans stayed at full power during the ~45 minute test. Sounded like a jet plane in my living room! Wow!

Hope this helps someone. Time for a beer now. Cheers.

Jun 29, 2009 10:50 AM in response to Josh Safranek

I have similar problem. My dual 2.0 G5 started freezing (freeze with no power to the mouse or keyboard). I have to power it down using the front power button. when powering it up it would chime and nothing beyond that, well except that the fans go nuts after a while.

one time it froze with this on the screen:

System Failure; cpu=1; code=00000009 (invalid pmap)
LATEST CRASH INFO FOR CPU 1;
eXCEPTION STATE (sv=0X61aaf780)
PC=0X000A7FDO; MSR=0x02003000; DAR=0xEFFFEF10; DSISR=0x02200000; LR=0x000A7F4C; R1=0xFC088891; XPC=0x00000098 (System Failure)
Backtrace:

backtrace terminated - unaligned frame and address; 0xFC088891
Proceeding back via exception chain:
Exception state (sv=0x61ab0280)
PC=0x000B7EDC; MSR=0x00009000; DAR=0x1F29A800; DSISR=0x40000000; LR=0x94701120; R1=0x00000000; XCP=0x00000030 (0xC00 - System call)

BSD process name coresponding to current thread: MSN Messenger Da


Mac OS version
9J61

Kernel version:
Darvin Kernel Version 9.7.0: Tue Mar 31 22:54:29 PDT 2009; root:xnu-1228.12.14~1/RELEASE_PPC
System model name: Powermac7,3

System uptime in nanoseconds: 141044408079
panic(cpu 1 caller 0x000B4E6C): System Failure: cpu=1; code=00000009 (Invalid pmap)
Latest stack backtrace for cpu 1:
Backtrace:
0x0009CC88 0x0009D63C 0x00029DA0 0x000B4E6C
Proceeding back via exception chain:
Exception state (sv=0x61ab0280)
PC=0x000B7EDC; MSR=0x00009000; DAR=0x1F29A800; DSIR=0x40000000; LR=0x00035620; R1=0x6133FDB0; XPC=0x00000014 (0x500 - Ext int)
Backtrace:
0x0001EA40 0x0001EC74 0x00025844 0x000B45CC 0xB5F21211
backtrace terminated - frame not mapped or invalid: 0xF0316720
Exception state (sv=0x6c475a00)
PC=0x946FA1F8; MSR=0x0200F030; DAR=0x53458A18; DSISR= 0x0A000000; LR=0x94701120; R1=0x00000000; XPC=0x00000030 (0xC00 - System call)
BSD process name corresponding to current thread: MSN Messenger Da
panic: We are hanging here...




Any ideas what the problem could be? Is one of the spu's toasted?

please help

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Get Startup Chime but no video

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