If you have an external or internal drive shows up in Disk Management as RAW and it's not accessible from My Computer while that drive was fine on another system.

When you press the power button from your PC, usually located at the front or top of the case and the PC doesn't turn on. Doesn't turn on in this article means that there is no light indicator, you can't hear any sound that indicates fan or hard drive spinning coming out of the system and nothing happens when you press eject button on your CD/DVD drive.

Your PC sounds like working, but you don't see anything on your screen?
No POST: Nothing shows up on your screen as soon as you power on the system and monitor.
No BOOT: You see some text message on your screen where we call it BIOS POST. After this post the system suppose to BOOT to your operating system or any bootable device attached.