[SOLVED] Motherboard won't turn on when mounted in a case

[SirJoe]

I have a system unit which won't turn on when the motherboard is mounted in its case. If I remove the board and place it on a wooden table, it turns to work fine but won't even power on when I assemble it back to its case. A friend told me to patch the case with Sellotape to avoid the motherboard touching the case. I have done all that but still the board won't power on in the case except on the table. Any help will be appreciated, thanks

 

[rolli59]

How are the standoffs in your case?
If in correct locations then it is the only thing in the case that the board touches apart from the I/O shield. The Sellotape tells me there is something wrong!