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Principles of Technology
Unit 3- Maintaining & Protecting Hardware
Identify the importance of keeping a computer clean. Explain what is needed to clean a PC. Identify the importance of protecting computer hardware
from theft and damage. Make a secure password. Protect a computer against viruses. Explain how to backup data. Identify how to protect computer hardware from power
loss. Identify common problems associated with computer
hardware. Identify routine maintenance tasks. Define problem solving & identify the steps. Identify criteria for selecting a computer.
Objectives
How much do computers cost?
You want to protect your investment
Easy to maintain◦ Keep it physically clean◦ Protecting it from bad software◦ Protect/Backup your files
Why Keep the PC Healthy?
What makes the screen dirty?
LCD/LED screens (Non-glass)◦ NEVER spray liquid or
Windex! Ruins the anti-glare coating Can leak into monitor
Dirty Screen
Pre-moistened Wipes
Spray & Cloth◦ Spray liquid onto
microfiber cloth
Use on LCD/LED, cell phone screen, Tablets, photo frames, etc.
Cleaning the Screen
What makes the keyboard dirty?
Could cause it not to work
Dirty Keyboard
Unplug, turn upside down & shake◦ Use compressed air
Use wipes
Spill?◦ Disconnect, turn upside down to
drain Sticky?
Hold on side & rinse Drain for 2 days
Cleaning the Keyboard
Can get sticky & dusty on bottom◦ Causes erratic movement
Sticky/dirty on top
Dirty Mouse
Your laptop screen is dirty. Why should you NOT use Windex to clean it?◦ Ruins the anti-glare coating & can leak inside
What can be used to get food particles & dust out of your keyboard?◦ Compressed air
When cleaning an LCD screen with a liquid pump spray, how do you apply the spray?◦ Spray onto the cloth
Review
Dust & dirt build-up Clogged fans
Dirty Computer Case
Use compressed air◦ DON’T blow dust inside PC!◦ Dust keeps PC hot
Vacuum outside case only◦ Anti-static vacuum inside
Wipes to clean surface
Cleaning the Case
How can dust damage your computer?◦ Clogs up fans; causes overheating
Vacuuming the inside of a computer with a regular vacuum cleaner can cause what kind of damage?◦ Static electricity can damage components
When using compressed air to clean dust from computer fans, how should you do this?◦ Blow dust outside of the computer, not in
Review
Organizing Cables Organizing cables under desk Velcro wire-ties
Take in air on bottom, expel heat out back
Cooling Stand◦ Keeps cool air going in◦ Prevents overheating
Padded Bags◦ Protect when carrying
Laptop Care
Protect from Theft Kensington Lock Secure physical devices Businesses or Personal use
Tracking Software◦ Identify location of computer◦ Alarm sounds◦ Lock device remotely◦ Erase data remotely◦ Remote camera activation
Protect from Theft
Protect from Environment
Shop for maintenance accessories
Project
Allows many plugs into one Not recommended!
Power Strip
Surge or Spike◦ Too much electricity◦ Lightning strike or power
fluctuation
Power Outages◦ No electricity
Protect from Electrical Damage
What’s a surge? An increase in voltage significantly above
the designated level
Surge Protector diverts extra voltage like a valve
AKA Surge Protector◦ Better than Power Strip
What to look for?◦ # of outlets◦ Joule rating
More joules better protection
◦ Cord length◦ Noise filter◦ $$ protection warranty
Surge Suppressor
Surge Protector Features
# of Outlets
Length of cord
# of Joules
Connected equipment warranty $$
UPS Uninterruptable Power
Supply
Battery backup PLUS surge protection & noise filter
Will power equip until you can save & shutdown◦ 10-20 min.
Find a single outlet surge protector for your laptop
Find a 6-8 outlet surge protector (strip or wall) for computers with at least 2500 joules
Find a surge/UPS strip with at least 10 minutes of backup time
Comparing Surge Protectors Handout (group)
Surge Protector Homework Handout
Project
Don’t use easy, common words Mistakes:
Passwords
Most common password is…password◦ Also 123456
Tips & Advice:
Password Tips
Top 25 worst passwords of
2013
Strong Password
Checker from Microsoft
Prevents virus install & helps remove it
Enable auto-update◦ New virus’ made
everyday Be careful what you
download◦ AV might not catch
them all Name some AV
software
Anti-virus Protection
Office Max◦ McAfee Antivirus Plus 2013 1 & 3-user◦ Kaspersky Internet Security 3-user
Staples◦ Norton Internet Security 2013 3-user◦ McAfee Total Protection 2013
Best Buy◦ Kaspersky Internet Security 3-user
Walmart◦ McAfee Antivirus Plus 2013 3-user◦ Norton Antivirus 2013 3-user
Anti-virus Software Project
What files are important to you?
Data is very valuable
Backup data◦ External drive◦ Online
Protect Your Data
Image= Windows, Programs, Settings & Files◦ Used if entire drive stops working◦ The system image must be saved on a hard drive.
Files= your pics, songs, files◦ The files can be saved on a flash drive, CD/DVD,
external hard drive, network.
Backup Your Data
Win 7 Image
Win 7 FilesWin 7 Mac
How to Backup Data & Images◦ In groups of 2◦ Make a 1-2 page EASY instruction sheet with
pictures◦ Keep it organized with pictures under each step or
to the right◦ After checked, save as a PDF
Project
Which is a better password?◦ Mcdonalds1 ◦ puppydog ◦ 8564681445◦ 28Cr38teR_!
What 2 jobs does AV software perform?◦ Prevents virus install & removes it
What 2 things can you back up on the PC?◦ Image (programs & settings) and files
Review
What are some common problems people have with computers?
Common Problems
Crashed HD◦ Overheat, dropped,
shaken, wear out
Damaged media◦ Scratched CD/DVD◦ Dusty flash drive,
banged around
Printer Problems◦ Paper jams◦ Low ink or toner
Hardware Issues
Display problems◦ Check power◦ Check video cable
Loss of network◦ Loose cable◦ Wireless down
Incompatible device◦ Check if it’s plugged in
Hardware Issues
Routine Maintenance Visual Inspection
◦ Check cables Plugged in Good condition Inside computer too
Care for Removable Media
Avoid extreme temperatures
Don’t touch media surface
Hold optical disks at edges
Keep disks in case when moving them
Useful Life Personal PC: 3-5 years Special Recycle
◦ Check with town/county Donate
Buy or Upgrade Consider the costs to upgrade versus a new
PC
8GB RAM= better performance; you have 4GB◦ You need 4GB more RAM & a 1TB hard drive◦ RAM: $50◦ Hard Drive: $100◦ New computer would cost: about $500
Is it worth it? Is your PC in good shape & performing well?
Buying a Computer
What to consider◦ Who is using it?◦ What will it be used for?◦ List the tasks, software
Check requirements◦ Portability or not◦ MAC or PC◦ Brand/Reliability◦ Storage devices◦ Peripherals- how many?◦ Warranty/Support
Support & Warranty
Product Support Product Warranty
Tech support (for the hardware, not OS)
Company will help you troubleshoot
Free for a time period
Then, may charge per call/per hour
Written guarantee for a time period
If product doesn’t work, manufacturer will repair/replace
Normal wear & tear
Does NOT cover damage you do
Upgrading Components
New keyboard, mouse (check connections)◦ Anyone can add themselves
Add RAM or Drives/Cards◦ May require pro to install
Buying a Computer◦ Each student will get a budget amount◦ Meet requirements given◦ Add to your “My Computer” PPT
Slide 1= budget & requirements Slide 2= brand, model, specs, picture, price
Recycling◦ Look up your town’s/county’s computer recycling
program◦ Describe what to do with items
Project
What do you do when your computer has a problem?◦ Nothing◦ Call someone you know◦ Look it up◦ Fix it yourself◦ Buy a new computer
You should troubleshoot!
Solving Problems
My Troubleshooting Example
On boot, message popup◦ Unable to load library wxfw.dll. Attempted to load
<Key notfound>\wxfw.dll.Error code:126
Search online for wxfw.dll Found it was from a Desktop Weather
Program Found program & uninstalled Reboot & no error
Troubleshooting
1. Identify the problem (What’s the problem?)
2. Check Basic Solutions◦ Cables plugged in, just restart it, out of ink
3. Research for help & support◦ Internet, boards, tech support site
4. Talk to a technician & follow their instructions
5. Confirm it’s fixed6. Document problem/solution
Troubleshooting Examples
PROBLEM:
OS does not start or starts and freezes
Cause & Solution?
PROBLEM:
Newly installed software doesn’t start
Cause & Solution?
PROBLEM:
Beeps during POST
Cause & Solution?
PROBLEM:
Hard drive makes unusual sounds
Cause & Solution?
PROBLEM:
Computer does not start at all
Cause & Solution?
Troubleshooting Scenarios- Check the basics
The entire computer has completely frozen up. I can't click anywhere on the screen. I can't even use the Start button to shut it down. ◦ Ctrl + Alt + Delete
I press print & the printer does not respond at all.◦ Check the cables; what other solutions?
Review Which device protects a computer from
electrical surges?◦ Surge suppressor
What rating on a surge protector identifies the amount of extra electricity it can handle?◦ Joules
UPS stands for what?◦ Uninterruptable power supply
What is the purpose of a UPS?◦ Gives you time to save files & safely shut down
when the power goes out
Review When troubleshooting, what would a basic
solution be?◦ Checking the cables to see if they’re plugged in
What is the last step in troubleshooting?◦ Document the problem/solution
T or F. When you have a problem, you should contact tech support immediately.◦ False
Principles of Technology
Unit 3- Maintaining & Protecting Hardware
