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So basically my friend installed 4.75 ita Dex on 4.50 ita Dex now the console does not turn on
Is there a solution on turning it back on?

It doesn't power on at all or what?

Yeah, It beeps one time and nothing happens

Is the green light staying on or also shutting off? Or, in other words, are you sure it isn't just black-screening? Or is it just: you press the power button, you hear one single "beep", and everything is off and its dead? Sorry just trying to clear that up..

Can you get into recovery mode?

Are you still having issues?

Yes, same issue

And all you did was update th cfw, Correct?

Basically, when my friend clicks on the power button, a green light comes on for a sec or 2 and everything shuts

Yes, correct

If you can get to recovery mode, try to install this
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or this
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one of them should work for you

If that doesn't work, try option "restore ps3 system"
This will format the hdd and wipe everything (games,saves etc)
When it is finished, you will be brought to a black screen, asking for your last syscall(last cfw installed)
reinstall your cfw, or a downgrader and then your cfw

If your ps3 freezes when selecting any options in recovery mode, you can assume the hdd is corrupt and will need to be replaced with any 2.5" sata hdd.

If you cannot get to recovery mode, then something is damaged or corrupt..

At that point you could try a new 2.5" sata hdd..

if that doesn't help, your flash may be corrupt..
You could flash a good backup to the console (if you have one..), if that doesn't help then I would assume the console overheated or an internal component popped or fried. fatal.

Let us know if you have any luck. If you need any more help, just ask.