PSU block / POWER SUPPLIES . . . . . Big block that gives your PC power *they're basically step down transformers Converts AC power to DC power Like puzzle pieces they all fit perfect . . . . . 2 piece ATX POWER CONVERTER (multi coloured wires - indicate YELLOW 12v , RED 5v , and ORANGE 3.3volt ) ATX12V is typical power for CPU . . . . . . . . SOME OLD ASS COMPUTERS USED "MOLEX" TINY MINI CONNECTOR for floppy drives . . . . . . . . Once again - small black SATA CONNECTORS . . . . . . . PCIE connectors are for video cards . . . . . . . huge MODULAR CONNECTOR like a big adaptor - so you don't have cables going everywhere Purists say you should use soldered power supply *not the big MODULAR CONNECTOR . . . . . . . 80PLUS RATINGS GUIDE (power efficiency rating) . . . . . . . HEAT SINK & HEAT DISSIPATORS - COOLING BAR FINS + FANS for air flow . . . . . . . When systems OVERHEAT they REBOOT BIGGER FANS *LESS NOISY because they TURN SLOWER (liqui...
BIOS programs are codes - BASIC INPUT /OUTPUT SERVICES *on way before O.S. or "driver" installed FIRMWARE is burned onto this chip. SOFTWARE is merely copied (electronically or magnetically) . . . . . . Modern motherboards tend to have 2 BIOS chips -incase one goes bad. YOU CANNOT OPEN a BIOS CHIP . . . . . . BIOS chips have P.O.S.T. (power on self test) built in aka A TYPE OF SELF "SERVICE" DIAGNOSTIC *SERVICES make sure drives and monitors can talk to each other . . . BIOS has CMOS (system setup) also built in When CPU first gets turned on it tells BIOS to send out "POST" to wake everything up . Tiny beep sound means PC is booting up . . . . . . If POST signal finds something wrong it will do a beep code. Error code. Or - visual error code on plain black error screen . . . . . . WHAT IF NOTHING HAPPENS WHEN YOU TURN ON PC? No error beeps/screens? In this scenario use a POST-CARD! Tiny hexadecimal 2 digit read out (looks like flux capacitor)...
IPv4 ADDRESSes built the internet. But they ran out of combos in late 90s NAT "network address translation" fixed this You used to have to be manually assigned a network ID via your internet provider Downside of this was your network ID was public to hackers = therefore FIREWALL was born . If someone got past your " Firewall " all of the PCs on your WAN & LAN were vulnerable **NAT fixed this too** NAT router/gateway will now give private IP addresses to all PCs on a LAN . Your private IP ADDRESS goes through NAT gateway & the gateway camouflages your address as its own LAN address (Kinda slows things down unfortunately) . .
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