I have put new paste on the CPU. Switchen on the pc and it lit up. On the mb there are 4 small leds for the CPU, gpu, ram, boot. When the mb lit up the dram led lit up instead of the CPU. So I tried all variations with memory sticks and now it won't start again. When I switch on the power switch on the psu the mb flashes quickly and then the dram led lights up. Is there any way of checking if the psu is faulty? Or do i just have to buy a new one and hope for the best?