Only A1, A2 and DIMM slots are available.
Only A1, A2 and DIMM slots are available.
The motherboard supports dual channel with A1/A2 and B1/B2 slots. The correct setup is A2, B2, but the system fails to power on. The error 55 indicates a memory installation issue. You have two RAM sticks, and only A1/A2 works. It might be a compatibility or installation problem with the specific RAM type (DDR3).
Typically when both B slots (or A slots) fail, it indicates a dead memory channel in the CPU's memory controller. You can verify this by connecting another CPU or bringing your CPU under test.
It seems your memory performance might be affected by a faulty CPU or motherboard. Without clear evidence of damage, it's hard to pinpoint the exact issue. You might want to try adjusting the mounting pressure on the B channel, but based on your description, it probably won't resolve the problem. The hardware could be old—possibly near the end of its life—and might simply be failing. Let me know if you need further guidance.
1. The CPU isn't firmly placed and some memory controller pins aren't connecting to the B1 and B2 dimming ports. Verify the CPU is correctly seated and inspect for bent or missing pins. 2. A faulty RAM stick is causing errors when connected to the B1 and B2 slots. Test by using only one RAM stick at a time and attempt booting through the B1 or B2 ports. If none work, further troubleshooting is needed.