Oh yeah.. good few tips.
When plugging in IDE cables (the wide strips that plug into hard drives and cd drives etc) the outside red line nearly always goes closest to the power connector.
You can make a computer work with just a PSU (Power Supply), motherboard, CPU, Memory, Video Card, monitor and keyboard.
It won't do much, but you'll at least see the Bios information. This is how I build mine, then I add bits on (like floppys, hard drives, sound cards, etc etc)
If you don't even see the bios info using this most basic config, it is most likely that the CPU is not being clocked correctly, or the memory is not properly installed.
If you're a beginner, get a good motherboard which can auto-sense the CPU speed and install good compatible memory. Try not to mix memory types, this can lead to failures etc.
If the M'board will not auto clock, read the manual - it's usually straightforward but if you rush it you can destroy the CPU.
You can have a maximum of 4 drives on IDE, you need at least 1 hard drive. There are 2 IDE cables and you can have 2 drives (master and slave) on each cable. Be sure to check the drives are set to either one or the other. You cannot have both on the same cable.
Setting up the bios gets most people who ask me for help - most bios's have a hard drive auto detect. Use that to configure the hard drive, if you can do that you can usually leave the bios until later - most computers will run fine on the config I have just given you.
You may have to change the order in which the computer boots from the drives, in order to install the OS. all this isin the BIOS.
Last thing - get a good anti stat wrist band cos you *can* fry parts of your computer just by touching. If you don't have one, be sure to touch the frame of the computer periodically to discharge the static.
Hope this helps
Tels
ps to all those in America I'd like to let you know we here in UK are totally shocked and disgusted by the events in NY.
Just sorry we're so far away we can't do more - My condolences and prayers are with everyone there