a month ago i purchased a refurbished dell precision m2400 mobile workstation. its got a 2.5ghz core 2 duo processor. i downloaded SpeedFan and the temperature readings range from 60 deg C to 75 deg C. From what i have read, this seems a little high. This laptop is supposed to be able to handle some pretty demanding programs, but it reached 75 deg when only 2 pdfs and firefox were open. Should i be worried about this reducing the lifespan of the processor or other components?
Once 75 is reached, the fan turns on and within 15 or 20 seconds the temperature is back down to 62 deg. if this is still a serious issue, i may just return for another because i am still within the time limit

Recently my husband installed Ubuntu onto an external Hard Drive and it works for the Acer Aspire but it does not work for the Dell Dimension 4100. I have not told him I tried this, but I just want to be able to get it right without him telling me.

G4 PowerMac Bundle
PowerMac G4/1.25GHz tower (Mirror Drive Door) and 17″ Apple Studio Display

Apple Studio Display 15″
Flat Panel Braided, ADC Connector

Apple Studio Display 17″ Graphite Logo
Flat Panel, ADC Connector

Apple Studio Display 17″ Silver Logo
Flat Panel, ADC Connector

Dell Optiplex GX270 Slimline
512MB Memory / 80GB Hard Drive

G5 PowerMac 1.8 GHz Bundle
PowerMac G5/1.8GHz DP and 17″ Apple Studio Display

G5 PowerMac 2.0 GHz Bundle
PowerMac G5/2GHz DP and 17″ Apple Studio Display

iMac G4 700 MHz (flat panel)
256MB RAM / 40GB Hard Drive / 15″ flat panel screen / CD-ROM drive

PowerMac G4/1.25GHz tower (Mirror Drive Door)
512 MB RAM / 80GB hard drive / Combo drive (CD-RW + DVD-ROM)

PowerMac G4/1GHz tower (Mirror Drive Door)
512 MB RAM / 40GB Hard Drive / CD-RW drive

PowerMac G5/1.8GHz DP
1GB RAM / 80GB hard d