Hi,
Here is a link to the [http://downloads.dell.com/manuals/all-products/esuprt_laptop/esuprt_latitude_laptop/latitude-e5410_service%20manual_en-us.pdf|service manual] for your laptop.
Click on the ''Diagnostics'' link in the page to find what the LED error codes indicate.
If for example it is the middle LED that is flashing this indicates a Memory compatibility error
Check the following:
1. Install compatible memory modules.
2. If two modules are installed, remove one and test. Try the other module in the same slot and test. Test the other slot with both modules.
3. Replace the memory.
4. Replace the system board.
Hopefully this is of some help