Most hard drives pull about the same power, depending on speeds and
brands, but generally within a logical window. Adding additional hard
drives will stress a system, but typically replacing one with another
should not cause any issue.
The NTLDR missing is referring to a NT Bootloader file that might have
been loaded on the first sector of a specific hard drive. If the
configuration changes in BIOS or if hard drives get swapped around you
can get this error, but it isnt too terrible.
Most power supply testers work well, I wouldnt spend a lot on one due
to a specific brand, they are really only testing voltage, a simple
voltmeter would work as well, I use a paladin tools one.
The main issue, freezing... If you havent added any hardware, or
installed any specific software recently it could be hardware as you
assumed. Depending on the type of processor you have the symptoms
could be going towards that. When your computer freezes and you
reboot immediately go into BIOS and see if there are any temp readings
that you can see real-time. If they are hotter then you would think
then it could be a processor fan. Some older motherboards have small
speakers built-in on the board, hard to see, but make a lot of noise.
If the temp is hot, or if you have no data in BIOS for this then let
your system cool down 100% and take off the processor fan, either
replace it or clean it up really well. Get some thermal grease from
an internet shop or local computer store.
A replacement fan usually costs under 20 dollars, and comes with
grease most cases. Replacing this would be a cheap fix if it were the
issue. A lot of old thermal grease breaks down or gets hard and
doesnt conduct heat well between the processor and fan. Check these
out and let us know.
Also, what model is the HP, how much memory, CPU type/speed, hard
drive speeds, power supply wattage? Any additional internal cards?
IE: Modem, ethernet, sound, video, usb, serial, etc.
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