PB Alu and its Cpu-fan

Question

This might be my last attempt to solve the problems with my dear pb. I bought an used powerbook 1ghz for about 6 months ago. Everything works excpet one thing, the cpu-fan (i guess). I can work for hours with cpu-temperatures below 60ºc. But when I do more intensive tasks, such as gaming, music production the cpu gets too warm. The fan is living its own life, not too concerned that its cpu-buddy is overheting. It activates sometimes, but far from everytime over 60º.
The result is a total system freeze, not a kernel panic with that dimmed screen with shutdown info, it simply just freeze . It's drivning me nuts. I would be better off with a non working fan than a fan that works occasionally. I've tried most of the tricks and solutions, p-ram, nvram, re-installation.. etcetc.
If someone has a feeling what the issue could be, and a possible soultion, please tell me. i'm greatfull for all reflections.
My system is 10.4.5, PB ALU 1GHZ 768RAM 60GBHD.
excuse my english

Answer 1

i just found another nice script:
ioreg -l -n fanspeed-sensor | grep -A 10 fanspeed
the mumbo-jumbo:
| | | +-o fanspeed-sensor <class IOService, registered, matched, a$
| | | | | {
| | | | | "polling-period" = <00000005>
| | | | | "device_type" = <" = "REAR LEFT EXHAUST"
| | | | | "type" = "fanspeed"
| | | | | "zone" = <00000000>
| | | | | "version" = <00000001>
| | | | | "compatible" = <" = <">
| | | | | "sensor-id" = <00000020>
| | | | | }
| | | | |
| | | | +-o IOHWSensor <class IOHWSensor, registered, matched, act$
| | | | {
| | | | "Power Management protected data" = "{ theNumberOfPow$
| | | | "polling-period" = 5
| | | | "current-value" = 0
| | | | "location" = "REAR LEFT EXHAUST"
| | | | "type" = "fanspeed"
| | | | "CFBundleIdentifier" = "com.apple.driver.AppleHWSenso$
| | | | "IOClass" = "IOHWSensor"
| | | | "IOPropertyMatch" = {"device_type"="fanspeed-sensor"}
| | | | "version" = 1
| | | | "zone" = <00000000>
| | | | "IOProbeScore" = 0
| | | | "Power Management private data" = "{ this object = 01$
| | | | "IOMatchCategory" = "IODefaultMatchCategory"
| | | | "IOProviderClass" = "IOService"
| | | | "sensor-id" = 32
| | | | }
| | | |
| | | +-o fanspeed-sensor <class IOService, registered, matched, a$
| | | | {
| | | | "polling-period" = <00000005>
| | | | "device_type" = <" = "REAR RIGHT EXHAUST"
| | | | "type" = "fanspeed"
| | | | "zone" = <00000000>
| | | | "version" = <00000001>
| | | | "compatible" = <" = <">
| | | | "sensor-id" = <00000021>
| | | | }
| | | |
| | | +-o IOHWSensor <class IOHWSensor, registered, matched, act$
| | | {
| | | "Power Management protected data" = "{ theNumberOfPow$
| | | "polling-period" = 5
| | | "current-value" = 0
| | | "location" = "REAR RIGHT EXHAUST"
| | | "type" = "fanspeed"
| | | "CFBundleIdentifier" = "com.apple.driver.AppleHWSenso$
| | | "IOClass" = "IOHWSensor"
| | | "IOPropertyMatch" = {"device_type"="fanspeed-sensor"}
| | | "version" = 1
| | | "zone" = <00000000>
| | | "IOProbeScore" = 0
| | | "Power Management private data" = "{ this object = 01$
| | | "IOMatchCategory" = "IODefaultMatchCategory"
| | | "IOProviderClass" = "IOService"
| | | "sensor-id" = 33
| | | }
| | |
| | +-o i2c-hwclock@1d2 <class PPCI2CInterface, registered, matched,$
dont know if this is usefull info or not...