If you getting noises from it but it wont switch on, it sounds like a faulty PCB.
Are there any lights showing on the control panel?
Hotpoint do have their own share of problems, however no more than other makes.
If your hearing a noise its unlikely to have tripped the fuse in the plug (which wouldnt be covered under warranty so though unlikely it is still worth checking before you call out Hotpoint).
Should the unit still be under warranty (extended or otherwise), then the PCB would be covered, the majority of these type of issues do tend to be the PCB, occasionally a failed switch or plug fuse, but since your hearing some form of life in the unit it makes me think its the PCB.