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3With the computer turned on, check the LEDs
LEDs
310 LNK — Lit green when connected to a 10BaseT port
3100 LNK — Lit green when connected to a 100BaseT port
3ACT — Lit during network data transfer activity
LEDs
3100 — Lit green when connected to a 100BaseT port
3LINK — Lit green with valid network connection
LEDs
3LINK — Lit green with valid network connection
3ACTIVITY — Lit yellow during network data transfer activity