Mac 3,1 Pro (early 2008) CPU Fan Reading "0"

-

hi all,

bought pre-owned mac pro 2008 on weekend.

using istats menus pro, observed cpu fan reading 0 while rest e.g. (exhaust, hd/expansion, power supply) giving normal range of 599, 799, 846 rpm respectively.

yet, bottom fan (of 2 front fans) spinning fast loud noise.
cpu temperature istats reasonable @ 37c 70c.

there observations several tests have done.
a) when detach front fans power, whole unit quiet. confirms noise come either of 2 fronts fans.
b) when disable top front fan (detach power), top fan stops spinning , unit noisy btm fan spinning.
c) when disable btm front fan, btm fan stops top fan still spinning. unit quiet.

(a) (b) (c) prove btm fan culprit. there 2 possibilities:
- physical btm fan faulty
- physical fan functional being instructed spin @ top rpm.

further connect signal cable top fan btm physical fan , left top fan detached. upon boot up, btm fan spinning nicely , quietly.
confirms btm fan working fine means reading sent btm fan erraneous causing spin @ highest rpm. yet, istats shows cpu fan rpm 0.

suspect m/b not giving right temperature fan unit, thereby wrongly instructing fan spin wildly.

advice experts here resolve issue?
in advance.
 

have solved problem of cpu fan?

hi pdafan,
found problem yours.
bought pre-owned mac pro 2006(1,1) last week. in several days before today, ran normally. today runs loud noise.
using istats pro, observe hd/expansion fan reading 0 while rest 3 fans spinning normally. unload side panel of machine, find top front fan spinning fast , blowing strong wind.
think problem same yours. difference problem top front fan while yours bottom front fan. system can't read speed value of fan, keeps fan in maximum speed protect machine.
so, have solved problem? if yes , have time, please let me know how solve it. e-mail gugule@163.com. hope receive letter. thank much.
 


Forums Macs Desktops Mac Pro


  • iPhone
  • Mac OS & System Software
  • iPad
  • Apple Watch
  • Notebooks
  • iTunes
  • Apple ID
  • iCloud
  • Desktop Computers
  • Apple Music
  • Professional Applications
  • iPod
  • iWork
  • Apple TV
  • iLife
  • Wireless

Comments

Post a Comment

Popular posts from this blog

Carrier post Error specific

-
rosstoal yesterday 03:48 pm kryckter go last post 1 308 go first new ios mail + gmail & wifi ntepperman yesterday 03:46 pm kryckter go last post england vs costa rica live stream italy vs uruguay live stream greece vs ivory coast live stream japan vs colombia live stream england vs costa rica live stream italy vs uruguay live stream greece vs ivory coast live stream japan vs colombia live stream inglaterra vs costa rica en vivo uruguay vs italia en vivo colombia vs japón en vivo inglaterra vs costa rica en vivo uruguay vs italia en vivo grecia vs costa de marfil en vivo colombia vs japón en vivo inglaterra vs costa rica en vivo italia vs uruguay en vivo grecia vs costa de marfil en vivo colombia vs japón en vivo angleterre vs costa rica en direct italie vs uruguay en direct grèce vs côte d'ivoire en direct japon vs colombie en direct italia vs uruguay in diretta england gegen costa rica live stream italien gegen u...
Read more

How to increase vRAM for HD3000 graphics

-
Image
terminal command increase vram hd3000 graphics (mac mini 2011 or macbook pro 2011) *mb - amount of vram have. can find in system profiler. 256mb 384mb quote cd /s*/l*/ext*/appleintelsnbgraphicsfb.kext/c*/m* sudo cp appleintelsnbgraphicsfb appleintelsnbgraphicsfb.backup sudo perl -pi -e 's|\xc7\x45\xbc\x00\x00\x00\x12|\xc7\x45\xbc\x00\x00\x00\x18|g' appleintelsnbgraphicsfb sudo touch /s*/l*/extensions click expand... from 256mb 512mb quote cd /s*/l*/ext*/appleintelsnbgraphicsfb.kext/c*/m* sudo cp appleintelsnbgraphicsfb appleintelsnbgraphicsfb.backup sudo perl -pi -e 's|\xc7\x45\xbc\x00\x00\x00\x12|\xc7\x45\xbc\x00\x00\x00\x20|g' appleintelsnbgraphicsfb sudo touch /s*/l*/extensions click expand... from 384mb 1gb quote cd /s*/l*/ext*/appleintelsnbgraphicsfb.kext/c*/m* sudo cp appleintelsnbgraphicsfb appleintelsnbgraphicsfb.ba...
Read more

Carrier [Information] AT&T NEXT

-
Image
just few questions on upgrade using att next program. i'm trying iphone 6 plus , seems impossible right in boston ma -does apple att next program if go in store self? - best buy let me use att next upgrade in store or on web , instore pick up? things have confirmed att next doesnt work(correct me if i'm wrong) -if place order on apple site using att next upgrade, not able in store pick up. have go store self , upgrade assuming have device in store .... kno if true i'm getting mixed answers... -target not let upgrade att next upgrade on web or instore. please correct me if i'm wrong opinion , answers welcome.   i did 2 next purchases @ apple store yesterday. think they'll long not trading phone.   Forums iPhone, iPad, and iPod Touch i...
Read more