SOURCE: My computer has power, but
Your PC may also be going into hibernation. Press the power button to wake it up.
SOURCE: Dell 5150c shuts down orange flashing light
It was a faulty or worn out power supply fan. I just replaced it and the computer has been running for about an hour and a half and still no shut down. The system temperature is stable. It runs quieter now. New fan cost 13.88CAD.
SOURCE: Dell 5150c shuts down orange flashing light
As a temporary measure, taking the side panel off the dell 5150c stopped it from shutting down, so in my case it was clearly a heat problem, as suggested by previous the poster. The following instructions assume you're comfortable replacing computer hardware components - do at your own risk!
The solution is to buy an 'air duster' and some thermal compound for the CPU heat sink. If your CPU fan doesn't sound healthy (mine didn't), also buy a new one (ca. £20 on ebay: search for G9474 ).
Read the service manual: http://support.dell.com/support/edocs/systems/dim5150C/en/sm/index.htm for details on how to install / remove the fan and heat sink.
Clean out dust from the heat sink with air duster. Remove the fan, and clean or replace (recommended). Also clean the grill in front of the fan. Clean off old thermal compound from the CPU / heat sink and replace with a thin layer of fresh compound. Replace heat sink and side panel and you're done.
SOURCE: emachine w5243 keeps shutting down
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SOURCE: Vostro 200 PC freezes on Dell Start up page & won't turn on
If you have windows 7 installed, then see if you can boot to the DVD and run a repair on the OS. You also may want to run a diagnostics on the system if you can get to the F12 menu
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