If the graph for a stock isn't moving during market hours, possible reasons could be:
Illiquidity (No Buyers or Sellers): If no active trades are taking place (no one is buying or selling), the price remains unchanged, and the graph may appear static or flat.
Stock Not Enabled for Trading: Some stocks may be temporarily suspended from trading due to regulatory reasons, corporate restructuring, or actions like mergers or demergers.
Data Feed Issues: A delay in the data feed from the exchange might cause the stock graph to appear unresponsive.