"Caps Lock and Num Lock LEDs blink continuously, can't get to BIOS"에 답변Check your ram modules. It is either loose or they are dead. Remove the Ram modules, wipe it with a lint free cloth, put it back in and see if the laptop is working. If not you will have to replace the ram module(s).
"Do I really need a anti-static strap/mat for dismantling a desktop?"에 답변Not really. Just disconnect all power to the desktop atleast 5 minutes before you take it apart.