B757-200
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Troubleshooting; Human-Machine Interface; Distraction
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance
Aircraft Equipment Problem Dissipated; Flight Crew Rejected Takeoff; Flight Crew Overcame Equipment Problem; General Maintenance Action
Human Factors
When we arrived at the plane the APU was already running.  During our preflight we were notified that we would be transporting a large quantity of dry ice and would need to use the dry ice supplementary procedures.  One of those procedures is to turn the temperature in the compartment with the dry ice to as low as it gets.  We did this.  Upon engine start we noticed that the right pack 'INOP' light was on with an associated EICAS message.  As I was going through my after start flow (flap handle; APU off; engine heats; left pack; right pack) when we got to right pack we started troubleshooting the issue.  We followed the QRH which required a 5 min wait time to see if the issue is fixed.  We proceeded to taxi while we timed the 5 min.  After the 5 min the pack reset and worked normally.  We believe that the high OAT and humidity caused the pack to freeze up and fault due to the low selected temperature.  On taxi we also had to balance some fuel due to the APU burn on the ramp.  Operations were normal to the runway.  Once we started our takeoff at 60 knots we got a right bleed off message.  Captain executed a rejected takeoff and we exited the runway.  After cleaning up the aircraft and completing the rejected takeoff QRH checklist we contacted Maintenance and trouble shot the problem.  We soon discovered that the bleed air isolation valve was open.  In troubleshooting the pack issue after start; I had not finished my flow and closed the isolation valve.  So on takeoff the air from the left engine overpowered the right and closed the right bleed valve giving us the offending message.  We re-ran our checklists and made sure our brake temp cooling was OK and departed uneventfully. Multiple non normal issues caused the flight crew to miss a flow item.
B757-200 First Officer reported procedures and checklist were not completed due to multiple distractions. After maintenance action flight departed normally.