I changed recently my HDD to SSD Samsung 850 EVO.
I reinstalled new Windows copy and all drivers from Dell website (starting by Chipset).
90% of time boot is takes 40sec but 10% of time it takes 2min.
I checked ntbtlog, and saw a lot of occurence of errors,
Did not load driver @nettun.inf,%isatap.displayname%;Microsoft ISATAP Adapter
Did not load driver @battery.inf,%*compbatt.devicedesc%;Microsoft Composite Battery
Did not load driver @netrasa.inf,%mp-pptp-dispname%;WAN Miniport (PPTP)
And many more,
What this could be,
Any suggestions ?
Check for Notebook System Software for your model. That must be installed first along with chipset or the other drivers do not load properly. That software might be listed under Utilities or Software in the driver list.