BIOS shows wrong motherboard temperatures

I have recently built a Mini ITX system based on a Pentium 4 CPU (P4 HT 631).The CPU was bought off Ebay for 5$ and the motherboard was salvaged from a local recycling center. The system works fine, it boots in Windows, i can browse the inteet, watch videos ,etc.. .The only problem is that it runs quite hot (expected because of the P4).

The system:

- Pentium 4 HT 631
- Commel LV-672 system board
- 512 MB DDR2 400 SDRAM

So i wanted to see how hot it gets when idle and i stuck my k-type multimeter sensor inside the heatsink.The results:

• the multimeter shows 49°C (i can feel on my hand how hot the heatsink is)

• the BIOS shows only 27°C and even worse, the system temp is 19°C ! (while the room temperature is 25.2°C)

What could be wrong ?

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