Don't worry, in this day and age remember "K.I.S.S.", and
always follow this hardware checklist:
1: Foolish as it may seem, ALWAYS check that the power is on
2: Check all cables and connections, and try it again
3: If it still doesn't work try re-seating all cable
4: Does the device seem to work?
5: What symptoms does it have?
for Cooling Fans
for Power Supplies
for CD or DVD drives
Article by Slam. Last revised June 2004