I have an Intel DZ87KLT-75k based system and it was working great since it was put together until I started experiencing an odd issue about a year ago, once in a while it would power cycle before posting and then boot. Then it would power cycle more than once before it posted and booted. Then a few times it power cycled over and over for lengthy periods of time before it booted. It took about a year for the issue to slowly evolve to the point we're at now, slowly day by day getting worse and worse.
Last week if I powered the system on, it might power cycle for hours until it eventually booted up. This week it won't boot up at all, just power cycles over and over and over and won't POST.
During all of this, after the system booted it ran flawlessly. Never a blue screen or crash, video games were great, no issues at all.
Here are diagnostic details
- nothing changed between system working fine and system power cycling
- not currently overclocked, may have been a few years ago
- CPU is not overheating
- swapped out the RAM
- swapped out the power supply for a big one
- swapped out the video card with a small one
- disconnected everything but front panel header & cooling fans
- pulled CMOS battery & unplugged system for 24 hours
- tried jumpering BIOS for configuration but not getting that
- the code seen on the code POST LED during this cycle go like this (watched in slow motion)
00:00, 00:10, 00:18 (micro second), 00:15, 00:14, (two other sets can't make out), dd:26, dd:28, dd:3b, dd:39, dd:58, dd:44, dd:69, 00:55, 00:21, 00:03, 00:10, 00:00 (flashes for a sec), off
Some of these numbers may be wrong due to how fast they flash but the dd:26, dd:44, 00:21, 00:03, and 00:10 appear long enough to be certain
I would be tremendously appreciative if anyone has any successful advice as this system was perfect for my needs, handling everything including the latest games with ease, and I'm not at all in the mood to reconfigure a new system.