I did not change anything. Not even working stock of Promer & Probe, enzyme, dNTPs all same as used before. But now I did not getting Positive control also. I tried more than 5 times but same results. Nothing missed during Mastermix Preparation.
Hi, if you are sure that all the reagents are ok, and the control positive too, did you control the machine? You said no results but you are sure that the machine work well and start the reaction? For example with the 7500 you can decide to not register the signals reaction with only a click. I t is only a suggestion.