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Radeon hd 4870 X2 - 3 red lites ...

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Hello. Out of the blue, after several years of running fine, my monitor goes into "power saving mode" I cant get out of. Snooping around I see 3 red lites on my vid card, both vid cards actually ( I have 2 in Cross fire mode. I cannot figure out why the issue has occurred. I've moved my cards arouind, went to each as a single card, changed out my psu......still 3 red lites. On occasion I can get as far as being able to get into BIOS, but quite quickly and before I can do much looking around, back into blank screen and 3 red lites.

So: 1) are the vid cards bad....both......at the same time?
2) I did change out the PSU without any luck.
3) Could it be a bad MB? It's an ASUS P5Q Deluxe
4) What else could it be?

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The 3 lites are labelled:

HD4870 LEDs

D1601 - Red LED On, shows critical temperature fault

D1602 - Red LED On, shows External power connector A was removed

D1603 - Red LED On, shows External power connector B was removed

D601 - Red LED On, shows critical Core power fault


This suggests a power source as the culprit. This, as well as what I've found on other boards, is why I changed out the PSU, thinking that this was a likely culprit. The "old" one was a Rosewill 1000, the "new" one a Rosewill 750.

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Seeing D601 is a expensive problem-it usually means the card's dead.
I'm sure I had this with a new build years ago, the problem turned out to be the CPU heatsink had not seated correctly, the pushpins had not fully locked and the CPU overheated in a few seconds.
And, as I recall, there were issues with the retention pins going soft and loosing their grip over time, perhaps this is the problem?

Well, that's exactly what it was. I took apart the cpu cooler (Zal) found the cmpd to be dry and crumbly, replaced it with fresh, rebooted, and viola! It works again.

Thanks for the brain nudge Coozie!
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