I voided a few of my N61Jq laptop's warranty in four ways:
1. OC'ed the Mobility Radeon 5730.
2. Adjusted the BCLK to OC my pathetically weak, locked quad-core i7 720qm (1.6 GHz) by altering the registry of a locked software. Then I backed off when I noticed it was overdoing the OC. 133Mhz to 143 Mhz even with the slightest adjustment was frightening.
3. OC'ed my 8GB 1333 MHz RAM to 7-5-4-17. Sadly the CAS was locked, and I had to abandon the OCing because the OCing software constantly crashed and undid the OCing, even though the RAM timings were stable under Mem86. I do have the admit one of the error messages was amusing, "xxxxx Divided by 0"
4. Replaced the crappy thermal paste for the cooling system after breaking the GPU's and CPU's warrenty stickers. Then I dropped two of the fan's case's screws, one of them was stuck between the chassis and a cable. The other was jammed between the chassis and small PCB board that connected the AC adapter's plug to the motherboard. Shaking the laptop only made it worse.
One of my friends told me to stop eating butter while working on computers when I told him about it.
On my previous Dell Inspiron 6400 laptop, I upgraded the CPU and undervolted it. Then my hard drive died within days. My dad blames Spyware Doctor to this day.
EDIT: Oh, and I also tore apart an Antec USB-Powered Notebook Cooler and tried to reverse the air flow by splicing the wires. I initially used a knife to cut away the insulation, then I got impatient and took a BBQ lighter to burn/melt it so I can peel it away. The reversing mod didn't work, so I undid the splicing job and taped it back together.
EDIT2: I just learned that my dad had bought a extended warranty after placing an order for the N61Jq laptop. Edited by A Bad Day - 6/25/12 at 3:52pm