When you installed the new hard drive, was it purchased from HP as the hard drive for the T1100ps, or did you install a generic hard drive like for a laptop?
HP uses a special formatting on their hard drive with its own operating system with the latest firmware already installed (not windows o/s), so just installing new firmware will not work...the plotter must be on and in a ready state to receive the firmware update.
SOURCE: The HP DesignJet T1100ps printer has a 79:04 error
hp will never tell you but this error is a kind of a catch all error basically the service manual says to reload the firmware. check the file you are sending. i have seen a bad file cause this error. hope this helps.
SOURCE: HP designjet t1100ps error 21:13
This is a service station error indicating that the printer could not move the pirnthead mechanism over the service station. First check to see if there is anything in the carriage path such as a piece of paper blocking the carriage. If there is not then it is likely a bad service station that will require replacement. Always try powering pirnter off then on to see if it was temporary error.
SOURCE: Just got a new HP
Issue with the service station. Turn off and turn on your printer couple of times. Try moving the carriage assy., manually.
Still if it don't work then the service station would have gone bad. Needs to be replaced.
SOURCE: error 8:11 HP Designjet T1100ps
Error indicates Formatter,Hard disc & main PCA any one of them faulty.. Through light pattern we can estimate which part is faulty...Read carefully, understand the indications..
Led pattern: Power supply LED as 1
Formatter leds 3nos from left to right as 2,3 & 4..
* indicates "on"
# indicates "off"
& indicates "flashing"
* # # # ....Main PCA
* * # # ....Formatter
* $ # # ....Hard disc
* * * $ .....Main PCA or Formatter
Note down which LED are on.off & flashing,compare with above said indications find out the faulty part.. 
SOURCE: HP Designjet T1100ps 44-in Printer
Recommended for tec guys only:Error indication that service station error, open right cover check is there any obstacles in service station movement?.. check the service station connectors, if feel every thing is fine, remove service station, found dirty? remove motors, remove service station cover, clean entire unit with water, ensure that stocked ink entire should washed out, allow service station to dry, fix it up, apply grease for moving parts, fix entire back then try....for confirmation do the service test..** cleaning service station is dirty work but it will give good mileage, while cleaning take care of sucking tubes & drop detector unit.. Best of luck..
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