I think is four orange blinks and one green (if I count them right,is to quick sequence)
Today mine started this too.Same as you.
I think is related to wear level,mine is 60% on NHC
But still have one hour of usage (max...
In the time I found a way to fool Dell bios to recognise SATA expresscard.
Still need to have something who enable INT13 in BIOS and use Grub4dos to remap hdd's
Now I'm planning to buy two hdd's ,as far I'm thinking at
-WD Scorpio Black...
Some like that.
Set your multimeter on continuity test (most of them have this) and without any power source connected check coil marked as PL2 you should get a sound or some indication like when you touch together both leads.
If you get...
At first sight there is no diode for reversed polarity protection.
In some cases there is no need for such diode.
At a first look (since I don't have schematic for this model) seems like first two transistors in + path could...