Replaced ECM 1 about 2 weeks ago, ECM 1 had issues with erratic coolant readings. Replaced ECM1 with used one from a buddy, ecm2. Ecm2 already had modified drivers for 120's I am running. Parked car after going to show. Couple days later attempt to start car would not. Plugged in computer to check and tables ve, afr and some parameters set to zero. Attempted to load last tune I was working on same thing. Loaded tune from start up ( long time ago) and car started. Adjusted parameters to match tune that was previously in car before issue. Saved tune and turned off computer. About 2hrs later attempted to start and nothing same thing as above. Attached laptop to check tune again and laptop would not connect. Checked - ECM fuse, good -chip, powerlogger, ECM connections. Good. -powerlogger laptop version, good. -Swapped ECM no change. -Disconnected power logger and installed old chip 60 lb gas/alky chip. Car started ( ran terrible due to chip not even close to car build now) Looking for answers here, I'm sure sd2 chip lost all tune info again that is why it will not run. But I can't Change anything due to laptop not being able to connect. - bad chip? - bad powerlogger? -bad cable/ laptop or software?