Question Error Code "00-4C-55-0d-30" showing on MSI Z170a Gaming M5 ?

ibrsbk

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Dec 31, 2014
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18,515
- MSI z170a Gaming M5
- i7 6700k
- Corsair H100i
- 2x8GB RAm DDR4 Corsair Vengeance LPX
- Corsair PSU RMi 650 w Gold.
- RX 6650 XT 8GB

My rig is about 7 years old and last week it froze while gaming for the first time. I upgraded my GPU 3 weeks ago and I had it all working stably for over 2 weeks.

I am very puzzled and have no idea what could be the reason.

After some failed attempts (clearing CMOS, reseating GPU, reseating and testing RAM, trying a new PSU, etc.), I eventually could no longer boot again using slots DIMM3 or DIMM4. So this "00-4C-55-0d-30" error code is shown in the mobo's debug led.

I used to have 2x8 GB dual channel on slots DIMM2 and DIMM4, as recommended. Even with XMP on. But now it does no longer work.

All old threads I am retrieving regarding the same error indicate it's a memory issue due to bent pins. But I am unable to see any. Can you?


IMG-20231025-234734.jpg

Here's another one:
IMG-20231025-234546.jpg


Pc works and behaves, apparently, fine with one stick of RAM, or even two, using slots DIMM1 and DIMM2. Any suggestions on what to try next?
 
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I noticed top left first four prongs have dust/strands/hair across them. Also far right, row nine, second prong from the right there appears to be something across that prong but I can't be sure. The motherboard itself looks like it could use a good cleaning of dust.