Mac Pro almost at 128°C while starting up

MacPro 2,1 almost all Temps at 128°C at boot. Leads to Fans at full blast on startup, what could be the problem?

I've often had the problem that all fans were at full blast on startup on my 2006 2,1 macPro (upgraded to 2,1) but a SMC reset usually did the trick... Now it doesn't. I've checked the sensor connections. Most of them still show 128°C which leads to the fans kicking up.

Here are all temps:

Macs Fan Control 1.4.10

MacPro2,1

CPU: Intel(R) Xeon(R) CPU X5355 @ 2.66GHz [100]

GPU: NVIDIA GeForce 8800 GT

macOS 10.11.6

Fans:

CPU_MEM-min{500}curr{1093}max{2900}mode{2,Tp0C,30,38}

IO-min{500}curr{1093}max{2900}mode{2,Tp0C,30,38}

EXHAUST-min{500}curr{1092}max{2900}mode{2,Tp0C,30,38}

PS-min{600}curr{1144}max{2800}mode{2,Tp0C,30,38}

TempSensors:

TA0P () - 128, 128

TC0C () - 128, 128

TC0D () - 128, 128

TC0P () - 128, 128

TC1C () - 128, 128

TC1D () - 128, 128

TC2C () - 128, 128

TC2D () - 128, 128

TC3C () - 128, 128

TC3D () - 128, 128

TCAG () - 80, 80

TCAH () - 128, 128

TCBG () - 80, 80

TCBH () - 128, 128

TH0P () - 128, 128

TH1P () - 128, 128

TH2P () - 128, 128

TH3P () - 128, 128

THTG () - 45, 45

TM0P () - 128, 128

TM0S () - 128, 128

TM1P () - 128, 128

TM1S () - 128, 128

TM2P () - 128, 128

TM2S () - 128, 128

TM3S () - 128, 128

TM8P () - 128, 128

TM8S () - 128, 128

TM9P () - 128, 128

TM9S () - 128, 128

TMAP () - 128, 128

TMAS () - 128, 128

TMBS () - 128, 128

TN0H () - 128, 128

TS0C () - 128, 128

Tp0C (PSMI Supply AC/DC Supply 1) - 32, 32

Tp1C (PSMI Supply AC/DC Supply 2) - 35.7031, 35.7031

Tv0S () - 127.902, 127.902

Tv1S () - 0, 0

Disk drives:

Samsung SSD 850 EVO 250GB - 29

MAXTOR STM3250310AS - 30

WDC WD2003FZEX-00SRLA0 - 29

And while working all 8 red lights on the memory DIMM Slots are glowing red (not blinking). The Mac still boots fine and shows all 20gb.

I'm absolutely puzzled and hope somebody can help!

All the best,

Alex


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