Getting new chassi, need new motherboard? (stupid PSU >_>)

oki so, my PSU is really stupid, it makes lots and lots of noise when i play a game and it, along with my current chassi, doesn't follow any standards so i can't switch it out >_> so i was thinking i'd just get a new chassi and a new psu and put my computer in that instead. question is then, will my current motherboard still work? or will i have to buy a new one of those too?
(computer isn't super amazing or anything but i won't be able to buy a new one anytime soon )

some computer specs i figured could prove usefull, if anything else could be needed i can provide such later

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• Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_gdr.070227-2254)
• Language: Swedish (Regional Setting: Swedish)
• System Manufacturer: FUJITSU SIEMENS
• System Model: SCENIC P / SCENICO P
• BIOS: Version 5.00 R2.10.1561.02
• Processor: Intel(R) Pentium(R) 4 CPU 3.00GHz (2 CPUs)
• Memory: 1022MB RAM
• Page File: 566MB used, 1126MB available
• Windows Dir: C:\WINDOWS
• DirectX Version: DirectX 9.0c (4.09.0000.0904)
• Motherboard name: Fujitsu Siemens D1561

thanks!
-The Bard

It looks like a microATX motherboard with a 20-pin ATX power supply connector. Most ATX cases should work with that. Make sure your new power supply has a 20+4 pin motherboard connector (the extra 4 pins is detachable so it fits your 20-pin).