On the flip side, being cheap is bad. Sometimes folks try to tackle computer projects that they shouldn't and it ends up costing them. Sometimes you need to hire a professional. You'll pay for car repairs, plumbing repairs, but when it comes to computers people think they should pay the purchase price of the computer and then nothing more. That's not reasonable.
Here's my list of what you should do on your own (if you can):
- Clean the inside of your case
- Replace optical drives
- Replace the batteries (cmos or li-ion)
- Replacing the video card
- Replacing the failed hard drive (If you get the exact same one and have a manufacturer's recovery cd)
- Replace the power supply
- Upgrading memory (unless you consult with the manufacturer for exact part numbers you'll probably bungle the speed and not follow proper anti-static procedures or buy more than your system board supports)
- Troubleshoot failing hard drives. (you'll probably bungle the job and lose your data).
- Upgrade the processor (you'll probably bungle the cooling system on it or at least skip necessary steps)
- Hijacks that involve a system that has critical data (that hasn't been backed up) on it (you'll probably lose the data if you call in a professional too late)
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