The bottom RAM slot on the T43 and a few others is known to have issues. Take the lower module out (not the one under the keyboard) and see if it POSTS — if it does, bad SODIMM slot.
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It can be repaired with a known good replacement board, or if you can reflow the solder on the pins that is also known to fix the issue.
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It can be repaired with a known good replacement board, or if you can reflow the solder on the pins that is also known to fix the issue. I know this isn’t what you wanted to hear, but a lot of “as-is” T42/T43 machines are due to this exact issue.
The bottom RAM slot on the T43 and a few others is known to have issues. Take the lower module out (not the one under the keyboard) and see if it POSTS — if it does, bad SODIMM slot.
It can be repaired with a known good replacement board, or if you can reflow the solder on the pins that is also known to fix the issue.