After shutting down my TS451 and cleaning dust off the fan, it won't run anymore

Dear Sir or Madam,

After shutting down my TS-451 to clean the fan and restarting it, the HDD1 light turned red, HDD2 was yellow-green, and HDD3 and HDD4 lights did not come on. When I reinsert the drives, sometimes lights 1 and 4 turn red, but in the end, the system buzzer emits a continuous beep and my computer cannot access the data on the NAS.

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