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Dell Dimension E521 Random Lock-ups and Restarts

  • Dell
  • Dimension
  • Systems
Last response: in Computer Brands
January 22, 2014 8:55:49 AM

I have a Dell Dimension E521 that was purchased new in 2007. I bought it with 1GB of RAM and immediately upgraded it with four Crucial 1GB DDR2 667 (CT12864AA667). A year later, I replaced the hard drive so I could load Windows 7 Pro without risking any data.

The only other change we made was the addition of a Zotac PCI Express x16 video card about two years ago (to add DVI functionality).

About 2 months ago, the system began freezing (no mouse or keyboard actions recognized) and then shutting down or restarting randomly. There are no signs of the action in the Event Log.

I have performed Dell Diagnostics and all components passed. I used my Antec power supply tester and it passed the test. I swapped to another hard drive and loaded a fresh OS and the issue followed it. I disabled the onboard NIC and installed a PCI NIC with no improvement. I installed Core Temp 1.0 and the CPU cores are running between 29 and 35 degrees Celsius. Case and Power supply fans are running.

I see no obvious bulging capacitors or overheated visible components on the motherboard.

In short, I ran through a bunch of diagnostic tricks and have found nothing. Sometimes just talking it out reveals something, so does anyone have any additional suggestions?


More about : dell dimension e521 random lock ups restarts

January 25, 2014 11:31:21 AM

You have done a lot of the right things!

Plug in the computer directly to a 110V wall outlet. Check performance.
April 27, 2014 3:11:59 PM

looks like you may of isolated the problem to the motherboard