The faster disk helps you when you get to the operating system part of starting up. Since it has made no difference and it's a clean install then logic says the delay is before the operating system startup.
I'd have said the same as Zero about a BIOS upgrade, since that is not the case then it's obviously going to be more elusive.
You say it has always been slow. 90 seconds is not particularly slow for a non-SSD machine. Not particularly fast either, mind.
Is it looking for a device which is not present or not functioning correctly? Usually USB.
Is it struggling with it's RAM. What happens to the boot time if you take 2GB out? (taking a different part of the memory out each time)
etc. etc.
Though at 90 seconds I might think it was too much like hardwork to find the problem.
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Slow Laptop new
Slow Laptop new