There is no reason why it shouldn't work. Check that no other keys are stuck down. and check that each of the keys CTRL, ALT and DELETE work properly.
Try restarting your computer as well
If you are looking to get to the task manager, press CTRL+SHIFT+ESC to get to it quickly
Bios - Device configuration - swap Fn /Ctrl Keys ---->Disable
it is not control alt down it it control alt delete
hold ctr, then hold alt, then hold delete
Alt+F4
The cast of Control Alt Delete - 2004 includes: Glenn Persson as The Featus
push control alt delete (ctrl alt delete) and then goes to task.
control alt delete.
control alt delete
Presss control alt delete
nk microsoft
Control - Alt - Delete
alt+delete+control is proected mode.
it might be 1 of the f numbers