HP C5550. When turning power on, screen goes blank and front lights start flashing.

When turning power on, screen goes blank and front lights start flashing. I have unplugged and changed ink cartrides. What next?

Hello hmnshgrwl,
Thanks for using Apple Support Communities.
For more information on this, take a look at:
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/ht3964
The System Management Controller (SMC) is responsible for many low-level functions on Intel-based Macs.
Best of luck,
Mario

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