Lights 1 and 3 indicates that system detects the memory modules/ram but configuration or compatibility exists.If you install a 3rd party ram or upgraded it make sure the memory that you installed is compatible to your system.Try to remove 3rd party memory module if there is one and just use the one that came with the machine. Try to power drain the machine, unplug power cable then press and hold power button. Reseat ram then put the power cable back in then restart the machine.check if this works...Cheers!!!
Hi,
The problem is due loose memory sticks or mismatched memory sticks.
You need to open the computer tower and reseat the memory modules on the machine to fix the issue.
How to do it ? follow the link below
http://support.dell.com/support/edocs/systems/dim5150/en/sm/parts1.htm#wp1364711
Thanks for using fixya
proton
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