recently from few days my pc makes loud noise (power supply fan is making loud noise at startup)

however, noise lasts for few minutes only and then it runs normal........

i searched on the internet and found that its because of the dust accumulated near the fan........
i tried to clean it with the help of blower, but didn't succeeded.......

i m sure the noise is coming from the smps (power supply)

is this because of dust or something else?

most it comes from worn bearings
this go's for all fans , not only PSU fan

PSU is better not repaired or even opened
if its real bad , buy a new one [ i recommend a stronger one ]

other fans may be replaced

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dust removal is best done with an artist-brush
gently loosen dust without force , avoid force !!
then remove dust with a vacuum-cleaner AT SLOW SPEED
if the fan spins very fast in airstream , it can damage the bearing
also remove dust from cooling fins on cooling-blocks [ same way ]

its a good idea to to this every year orso
dust-buildup blocks airflow

i m not able to judge whether the sound is real bad one or not
i will try to post the recorded noise that comes during start-up..........
@basflt: will u help me whether to replace or will work for now??????

$$$$$$$
it depends on your money
if you can live with the noise , its ok
as long as the fan spins , it cools the PSU
make sure its dust-free , so air can pass freely
if you can effort a new PSU , well , ok too

the reason its noisy when booting = power-usage
most fans are so-called "smart"
the speed increases when needed , [hot temp ] and slows when it can

hope this answers your question