Hi everybody
I’ve just had the same trouble after a cleaning session of my A1502 macbook (retina late 2013).
After disconnecting the battery 24 hours (no adapter neither), my mac started again and work like a charm: the battery appears to have 1800 cycles (to compare to the 1000 announced as his limit)
Those three bips seems not to be restricted to ram failure…
Best regards,
Thierry from France