Question I have 2, yes 2; P8P57 Rev 3.0 Mobo's that have the same problem.

[xkadet]

These motherboards, even when stripped to just the main connector and the cpu 8 pin, cpu fan, on/off switch--start and stop in 3 seconds. Then they start again and stop again. on and on and on. I removed the boards from the box and have it on a silicone mat. It has no memory, GPU, usb hookups, or mouse/keyboard. I push the start button and it comes up with a red cpu led that blinks on for a second and then just a blip again== no tone at all. This happens over and over again. But it's happening on 2 identical boards. One purchased just recently from ebay and the other started it after a 12 years run in a box running win7 that worked great for most of those 12 years. Then the CPU overheated so I took the fan off and cleaned out all the dust and then put it all back together. It started cycling this on off business. I checked for shorts or damage to the board and there was nothing. So, anybody have any help on this? Your time would be greatly appreciated. I just want to have my old desktop back working with win 7 because I use it to run a CNC router which has software that will not work with any Win above 7. Also, it works fine for the work I do. It runs my copy of solidworks 2009 with bells. So, I don't want to change it. Again, any help would be greatly appreciated.

 

[Misgar]

But it's happening on 2 identical boards.

Perhaps it's time to buy a different board? I've bought many good second hand boards on eBay and a few that didn't work, despite claims they were "working",

Then the CPU overheated

Is there a chance the CPU has suffered damage? If it was my rig, I'd swap in compatible CPU from another working PC and test the "overheated" CPU on a different mobo. Your CPU may have died.

the other started it after a 12 years

When my mobos reach this age, I check for burst electrolytics. Any suspect components and I "re-cap" the board. Check the tops of all electrolytics for bulging or splits or around the base for brown goo.

If the PSU is of a similar age (12 years) and had a 3 or 5 year warranty, chuck it in the bin and fit a new one. Electrolytics in PSUs eventually dry out. In extreme cases, they explode.

https://www.samaterials.com/content/why-do-electrolytic-capacitors-explode.html

 

[xkadet]

Great responses, everyone. I have tried 3 different CPUs in both boards and I've also replaced the batteries with new. However, after seeing the comments, I decided it might be reasonable to look into motherboard lifespan expectations and I see that I may be whipping a couple dead horses. I still may be able to find one on ebay that actually works, but it's reverse roulette at this point . I'm sweating the clock So, I'm going to try this solution: ASUS ROG MAXIMUS VIII HERO MB with a 7th Generation Core i7-7700T cpu, and Quadro P4000 gpu. I should still be able to run Win 7 on this and get the job done, while moving into at least somewhat more modern equipment. So, I'm not giving up on these motherboards, I've just got to get something working now. I do love a challenge and it's a great motherboard for its time, but these P8P67's will have to wait. Thanks again for all the great and quick (!) responses. Great forum.

 

[Misgar]

I see that I may be whipping a couple dead horses

By the sounds of it you've tried all the tests I can think of. If new CPU, RAM, GPU, PSU fail to get a board to POST, there's one obvious conclusion.

I've got several mobos that date back to around 2005 and they're still running Windows XP (offline). If the capacitors don't go bad, there's a chance a 20-year old mobo will continue to work. Apart from bad caps, if the mobo, CPU or RAM have been mishandled in the past and zapped with static, they may have died from ESD.

I bought an AMD FM2 mATX mobo with working APU and 4GB RAM for the equivalent of US $8 in 2024. I installed a faster CPU + 16GB RAM and popped it into a ZFS server chassis. Top of the range full size ATX mobos and fast CPUs from yesteryear can be expensive, but mid range or low end used components are usually much more affordable.