Blinking question mark folder on boot up, new HDD installed without OS
Macbook Pro 15" 2007
Ive recently repaired my Macbook Pro 2007 and installed a new 250GB HDD because I bought it without a hard drive, therefore I've never had or seen an operating system on the machine. As this hard drive is brand new (and compatible) I now have no operating system. I have a bootable USB with Snow Leopard, made properly with TransMac, all ready to go! Problem is - I'm not getting anywhere when booting while holding the "C" key (supposedly to USB boot). Another problem is booting while holding the "option" key, that leads me to a grey (or) white (hard to tell) screen with just the cursor - no options at all!
In fact, all of the Apple commands on startup are doing nothing, at all! Except the option key which as I said just leaves me at a screen with the cursor. Any ideas on what my next step should be? I'm a Windows kind of guy!
Is this a good question?