Are you sure you followed all the Dell procedures for safely removing/reinstalling the processor? Here's the Dell™ Latitude™ E6410/E6410 ATG Service Manual
, to check your work with, if you don't have one available.
I'd suggest looking at these LED Error Codes
(found in the Service Manual) that includes display and video card error codes. There don't appear to be any key combos that would do you any good:
Dell Latitude E6410 Function key combinations (Laptop)
F2 key during POST to get into BIOS.
F12 Boot device menu.
Fn + F1 Sleep/Hiberate per power management settings.
Fn + F2 Switch battery charger on/off.
Fn + F3 DCP Power Manager Battery Status.
Fn + F4 Switch Num Lk on/off.
Fn + F5 Switch Scroll Lock on/off.
Fn + F7 Launches DCP(Dell Control Point).
Fn + F8 Switch between laptop screen and external display.
Fn + D Switch display off/on. Helps save the battery without shutting machine down.
Fn + Z Reset fan temperature table and sensor.
Fn + → keyboard illumination off/on.
Fn + ← Switch Display Ambient Light Sensor off/on (brightness varies with ambient lighting).