So i just installed accelero s1 on my 4870 and on booting i saw 3 leds flash up. In windows all 4 of them are off until i start furmark for about 2 minutes and the core temp reaches about 50C. Then the second led turns on and furmark crashes. What can be the problem and maybe more important what do all the leds mean?

I have to say i didnt hava sinks on the rightside components( those black small square things 3 down 2 up next to the big vitec and pulse components) as i have only 1 long sink which doesnt fit on the cart.

Already plugged out some devices and reset my cpu overclock but didnt work so power is not an issue. Also the core and memory temps are fine so...