can't boot from usb

[elmassarihakim]

Hello,

i want to format my pc using bootable usb, but the probleme is the pc hangs if the usb key is plugged in; 

what i did : 

- i upgrade bios to v01.35  (last version available)

- i change boot order

- i used diffrent flash drive (still the same probleme)

i can't found secure boot in the BIOS to disable it.

i want let you know that i have 11 years experience in computer troubleshootings, i did a lot of search to solve this problem.

if i missed some things please let me know, ( i want format it using usb not CD)

Thank you very much.

Product name : HP Compaq dc7800p Small From Factor

SKU Number : KK266EA # AB6

System BIOS : 786F1 v01.35

[WAWood]

@elmassarihakim 

Given the date of your post, I would have expected someone to respond to it before this -- but since that has not happened, I will take a shot at it ...

With a Win7 PC, you should not be running into a Secure Boot issue, so that is not the problem.

The good news is, that the PC is trying to read the USB stick automatically; otherwise, it would skip over it an boot from the internal drive.

You said you tried two sticks and both failed -- have you tried these in other PCs and they both work?

Also, have you tried all the USB ports on the PC?  Asking because desktops usually have two or more ports on the front and 2 or more ports on the back -- so you should try them all.