I recentely bought a new laptop but ever since i've been having cracking and popping noise quite regularly and so it got the blame. I have discovered this morning it's my Rdac, I switched the hoover on as my mother was on her way round and sure enough it went crack and pop and the laptop dropped the Rdac. I know it not the laptop as ive been running it on it's battery when used for music and so it was'nt plugged in. Is this down to the maplins power supply or just our house's dodgy wiring? :?