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Melchieor

macrumors member
Original poster
Jan 24, 2021
77
98
I bought an HP Quadro FX 4500 and flashed it for use on the G5 per instructions on the macforums. The flash didn't work, it resulted in a black screen on the G5. I put in the old video card and heard a chime but no video. I tried to reset the board by pressing the switch same response . I removed the battery and reinstalled and same . I left it overnight with the plug off and connected it this morning and now I get no chime . I removed the video card and powered it up but the same issue. There are 2 red lights on. #2 and #7 . 2 I think means cpu overheat (not sure how since I didn’t touch anything there) and 7 is cpu halt. Just in case someone asks, yes the pcie cable which provides extra power to the video card was installed . I am not sure what happened. I can’t get my beloved G5 working again . Any ideas ?? I attached a photo of the red lights .
 

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Melchieor

macrumors member
Original poster
Jan 24, 2021
77
98
A bit of an update today. I left the G5 unplugged and PRAM battery out for the night . This morning I pressed the reset button and put the battery back in and turned it on. I heard a chime but black screen and same 2 LED lights on. :(
 
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MrVitalic

macrumors regular
Mar 16, 2020
164
205
I dont know. Maybe pure bad luck. If you feel for it, remove the cover and check if the pumps are working. Your G5 can boot with 1 cpu in ( the one of top, bottom cpu is ‘slave’). What I would do is pram reset, try booting, then reseat all stick of ram, try booting, then the fun part, remove your lcs, change thermal paste and install the top cpu, reinstall, try booting, if this work, install second cpu.
 
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MrVitalic

macrumors regular
Mar 16, 2020
164
205
I would be cautious with the smc reset on the logic board. Its written in the service manual that If you press this switch multiple time in a row, theres a risk of corrupting the smc. If you press this switch, press once for 10sec.
 
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Melchieor

macrumors member
Original poster
Jan 24, 2021
77
98
Thanks for your reply. Yesterday I tried a few things, removing the PRAM battery and pressing the reset button , and once again leaving it overnight unplugged . This morning I plugged it all in and put the PRAM battery but took the graphics card out. I am hearing a chime but then the 2 lights come back on. I tried removing the LCS however I couldn't find a tutorial for this specific model (quad 2.5) and was not able to remove it. I am starting to lose hope.
 
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MrVitalic

macrumors regular
Mar 16, 2020
164
205
Thanks for your reply. Yesterday I tried a few things, removing the PRAM battery and pressing the reset button , and once again leaving it overnight unplugged . This morning I plugged it all in and put the PRAM battery but took the graphics card out. I am hearing a chime but then the 2 lights come back on. I tried removing the LCS however I couldn't find a tutorial for this specific model (quad 2.5) and was not able to remove it. I am starting to lose hope.
The lcs for a quad is easy to remove. First remove the T bracket on top to make way and check down there. Theres a aluminium plate and all the hex screw are there to be remove.

in order:
-remove the G5 name plate
-remove the front fan/front duck/ and rear fan
-remove the T bracket on top of the lcs
-remove the 4 short hex screw securing the power lead for the processor x2 (black plastic bracket on the rear with wire)
-remove the 8 long hex screw securing the mounting plate (big aluminium plate) (8 screw or 10 I dont remember)
-Rock gently and lift the assembly (dont forget to remove the lcs power cable.

* theres also long taper screw/post, they are there to guide the assembly when you reinstall the whole shebang.

Good luck. It can be hard the first time when you dont want to break stuff.
 
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Melchieor

macrumors member
Original poster
Jan 24, 2021
77
98
Thank you , I will try following that guide. I tried taking it off yesterday but couldn't pull it out. I checked around the graphics card portion but don't see any issues there.
 

Melchieor

macrumors member
Original poster
Jan 24, 2021
77
98
. So after buying several liquid cooling systems and another quad I am having the exact same issue . The overheat led and the halt led . I think that there is just no power getting to the liquid cooler . Is there any way to test this ?
 
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