All data may be "cold".

1. If no lines of Speed, HP, Torque were recorded, the file was saved, probably accidentally, before any testing was done. That happens commonly when new to the software.

2. If there are lines of data recorded, but they won't graph out, then you will probably see a letter, usually a small "c" in front of every recorded HP, etc. number. That would indicate that the test data was performed under "Warmup" mode on the Test Screen and the test was stopped before progressing into the EGA Phase (which are recorded without a letter prefix).
To recover accidentally "warmup" recorded data, simply edit out each of the letters, across the whole line of data and they will graph out.
There is usually a minimum of 3 lines of valid, graphable data required before the graphing routine will allow a graph.

Properly speaking, the steady state test should be done, first with the "Warmup" checked, up to about 2/3rd's of the rev limit (you can set that rpm the Test Setup Screen on the Test Screen any time during the test) and then, when you reach the top rpm limit for the "Warmup Phase", the software will automatically drop you back to the starting rpm and you can do your full set of more valid data in the EGA Phase.

Hint:
Any time you have data in a file that you want to keep, but, you don't want that line of data to graph out, insert a letter, I use "x" for misc. reasons and "h" for "hot" and the graph routine will not recognize that number as a number and it will skip it. You have to add it to all the numbers on the line.

1. Cycle power on the black box or turn it on.

If not,

2. Check the computer / black box serial or usb cable for connection.

if ok,

3. Call 800 869-0497 or try manually selecting com ports in the dynocal.ini file.