Hello Experts, 

I have a stack of 4 cisco 3750 switches and its making lot of noise since last one week. Please have a look at the outputs below

S3N-100-ASW1#sh env all

FAN 1 is OK

FAN 2 is OK

FAN PS-1 is OK

FAN PS-2 is NOT PRESENT

SYSTEM TEMPERATURE is OK

System Temperature Value: 31 Degree Celsius

System Temperature State: GREEN

Yellow Threshold : 46 Degree Celsius

Red Threshold    : 60 Degree Celsius

SW  PID                 Serial#     Status           Sys Pwr  PoE Pwr  Watts

---  ------------------  ----------  ---------------  -------  -------  -----

1A  C3KX-PWR-715WAC     xxxxxxxxxxx OK              Good     Good     715/0

1B  Not Present

2A  C3KX-PWR-715WAC     xxxxxxxxxxx OK              Good     Good     715/0

2B  Not Present

3A  C3KX-PWR-715WAC     xxxxxxxxxxx No Input Power  Bad      N/A      715/0

3B  Not Present

4A  C3KX-PWR-715WAC     xxxxxxxxxxx OK              Good     Good     715/0

4B  Not Present

SW  Status          RPS Name          RPS Serial#  RPS Port#

--  -------------   ----------------  -----------  ---------

1   Not Present     <>

2   Not Present     <>

3   Not Present     <>

4   Not Present     <>

S3N-100-ASW1#

Does that denote an issue with power-supply on the switch? Could power supply failure make a switch stack noisy?