This script was pretty bloated - this can be done pretty easily with fewer lines, but it was one of my first.

PowerOnUCSBlades

#----------------------------------------------------------------------
# Name:         PowerOnUCSBlades.ps1                                   
# Author:       Matthew Oswalt                                         
# Created:      3/30/2012                                              
# Revision:     v0.2 - BETA                                                 
# Rev. Date:    4/30/2013                                              
# Description:  A script that powers on blades in a UCS system.        
#  		    Can be configured to boot all blades, or               
#				only those associated to service profiles in a         
#				given sub-organization. 						                                                                 
#----------------------------------------------------------------------
	
	# Import the Cisco UCS PowerTool module
    Import-Module CiscoUcsPs

	#Enable Multiple System Config Mode
	Set-UcsPowerToolConfiguration -SupportMultipleDefaultUcs $true
	
	
	#####################################################################################################################
	#       AUTHENTICATION             #
    ####################################
	
	#Stored method of authentication - change the two values shown below
	$user = "admin"
	$password = "password" | ConvertTo-SecureString -AsPlainText -Force
	$cred = New-Object system.Management.Automation.PSCredential($user, $password)
	Connect-Ucs 192.168.0.10 -Credential $cred

	#Connect using "old school" method. This method doesn't store passwords in plain text but less automatable, since you
	#have to log in every time. You will be prompted for credentials just like you were logging into UCSM.
	#Connect-Ucs 123.1.2.3 -Credential (Get-Credential)
	
	#There is a method of authentication that utilizes encrypted password XML files to allow automation in a secure
	#fashion, to avoid storing passwords in plain text, but keep the nice automated aspect that comes from not having
	#to enter credentials every time. That method will be included in future versions.

	#####################################################################################################################
	
	
	#Initialize Orgs Array
	$UcsOrgs = @()

	#Initialize Service Profiles Array
	$UcsServiceProfiles = @()
	
	#Initialize Choices Array
	[System.Management.Automation.Host.ChoiceDescription[]] $options = @()

	#Initialize $Line as string
	$Line = ''
	
	#Add Orgs to Array
	echo 'Getting organizational units from system...'
	echo ' '
	echo 'SUBORGS:'
	echo '================='
	
	$counter = 1
	foreach ($thisOrg in Get-UcsOrg | Select Name)
	{
		$UcsOrgs += $thisOrg
		$thisOrgString = $thisOrg.Name.ToString()

		echo " $counter. $thisOrgString "
		$counter++
	}
	
	#Allow user to enter a number to select desired Org.
	function getInputFromUser($prompt='Please type the number next to the desired Sub-Org and press <Enter>.') {
		Write-Host $prompt
		do {
			Start-Sleep -milliseconds 100
		} until ($Host.UI.RawUI.KeyAvailable)
		$thisUserInput = $Host.UI.ReadLine()
		$Host.UI.RawUI.FlushInputBuffer()
		return $thisUserInput
	}
	
	#Execute above input function and determine name of desired Org.
	$userInput = getInputFromUser
	$userInput = [int]$userInput
	$userInput--
	$selectedOrg = $UcsOrgs[$userInput].Name.ToString()
	
	#Present user with a confirmation dialog
	$title = "Start Service Profiles"
	$message = "You have selected $selectedOrg - do you want to start all service profiles in this sub-org?"
	
	$yes = New-Object System.Management.Automation.Host.ChoiceDescription "&Yes", `
    "Reboot all service profiles in this sub-org."

	$no = New-Object System.Management.Automation.Host.ChoiceDescription "&No", `
    "Do nothing."

	$options = [System.Management.Automation.Host.ChoiceDescription[]]($yes, $no)

	$result = $host.ui.PromptForChoice($title, $message, $options, 0) 

	switch ($result)
    {
        0 { #They selected "yes", so proceed with power state change.
			echo "Powering on all Service Profiles in $selectedOrg ..."
			$targetedOrg = Get-UcsOrg -Name $selectedOrg
			
			#For testing the script, comment this line out to prevent any changes from being made.
			Get-UcsServiceProfile -Org $targetedOrg | Set-UcsServerPower -State admin-up -Force
		}
        1 { #They selected "no" so output a confirmation and continue to quit.
			echo "You selected No. Exiting..."
		}
    }

#Disconnect Current Session
echo DONE
Disconnect-Ucs