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HP Pavilion Gaming Desktop PC TG01-1000i (8BG55AV)

Motherboard gets hot when computer shuts display down and cool down again when display starts. The computer idle power is 55W, but when display is down it is 90W, Some times over 100W, then motherboard is 80 Celsius . Does somebody know why it's happening. 

Graphics is NVIDIA GeForce GTS 450 now.

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