I have a Dell Vostro 3460 which we purchased from Dell 4-5 years ago. 2 years ago we had to replace the hard drive but otherwise has operated generally well. A couple of days ago it was shut down normally for the night but the following morning the machine did not start.

After trying a few things the machine did start and ran normally. Shut the machine down, no start. After more tinkering it started again and ran alright. Scanned the machine for malware - clean. Ran a system file check (though that shouldn't stop the splash screen) and no corrupt files found. Shut the machine down and no start.

We have:

1. Removed the battery and tried  the machine on AC only. 

2. Held the power button down while it was NOT connected to the AC or battery to force discharge the RAM

3. Attached a different AC power supply at a different AC power source (both used by another laptop without issues) - no response.

4. Held the Fn button while turning on the unit (with no apparent results)

The machines power LED light comes on and the 3 utility buttons (upper right corner above the keyboard) cycle through (they light up) but nothing beyond that. No boot up sounds when listening to the unit.

Any thoughts?