The first thing you describe could be some sort of vibration from the case, be it the movement of a fan turning & vibrating a removable cover for a DVD/RW etc... that's a bit loose. Or maybe a case/back plate screw coming loose etc... so maybe worth investigating that, or a stray cable that maybe hitting a fan as it spins, cables with stickers on, sometimes can hit the fan as well.
The electrical noise doesn't sound good. Could be the power cable socket on the back of the PSU is loose. It maybe worth just making sure the screws holding the PSU in place aren't coming loose. Also look to see if anything is poking out of the PSU fans that shouldn't be.
Does the power cable feel as though it is in snugly (while not forcing it) ?
If you do smell electrical burning at any stage, turn off the PC ASAP.
i5-760 2.8Ghz/Asus P7P55D-E / Titan Fenrir EVO/Kingston 4GB
2xWD C.Black 640GB (RAID 0)/Gainward GTX 670 Phantom/Corsair TX850w
Sound Blaster Z /CM 310/W7 HP 64bit/Asus PB278Q 2560x1440p
Zowie AM-GS/Filco Maj.2 (mx brown)/Senn.PC360/Corsair SP2500
Self built PC problems Here
Can i run game XYZ Here
How do PSU's work Here
Whats in your PC Here
Keep your PC clean Here
How to build a PC Here & Here