slim pc case upgrade?

I'm guessing it's a micro-ATX system so you would need a case that supports that specification. If it's an mini-ITX you'd need a case that supports that. You can usually tell by the number of expansion slots on the back or by looking at the motherboard.

You may also need a new power supply if the current one doesn't fit easily in the new case.

One other thing to be careful of is any proprietary connections that they use.

it has 2 expansion slots pci express x16, pci express x1 and its a micro atx and what psu would you recommend ?

yes thats what it looks like.

Your computer likely uses the "BTX" form factor then. It is not compatible with a standard ATX case.

okay? do you have any ideas on what could be done? is it possible to upgrade the case?

hey, i had an old big case that it seemed it would work and it did only the psu its too small and i have the case upside down because the psu isn't being held by anything i was wondering if this psu would work it has the connectors the cd rom and the hard drive uses (sata) anyway here's the link

Newegg.com - LOGISYS Computer PS550ABK 550Watts ATX12V Power Supply With SATA and 20/24 Pin connectors.