I have a problem.. I just got a new computer with Asus Radeon EAH4850 1GB VRAM,500W Power Supply, Intel Core 2 Duo E6550 2,34GHz, Mushkin 2x 2GB DDR2 800MHz and Asus P5Q Pro motherboard. And now i bought a new case for my components.. I switched all to my new case and when i start up my computer the display isn't showing and my Graphic Card fan is not running and showing 2 red LEDs glowing.. I dont know what it means. Before the new case it worked perfectly. I have tried reseating the card and checking if every cable is connected.

So.. What seems to be wrong with my computer ?

Hi Jeremiaza. Welcome to D-A-L and Happy New Year.

My guess would be that you did not ensure the mounting holes in the motherboard, and the standoffs on the case matched up, one-for-one. It is important to remember that cases are designed to support 1000s of motherboards. The case will have many more mounting holes than the motherboard does. If you have a standoff underneath that does not have a corresponding motherboard mounting hole, you may be shorting out the motherboard from underneath. You need to pull the motherboard and make sure. Most often, no permanent damage occurs. But sometimes, folks are not so lucky.

The mounting holes are matched up and it still does the same...

Oh man, I am sorry. I might have led you astray - though considering the damage that can be done, it is good to ensure the standoffs are good. I just read your opening post again and realize you said your graphics card "FAN" is not working. Does the computer boot at all? If not, did it ever work right?

I recommend you check the card's manual again to make sure you have any required extra power cables attached.

Yes it does boot.. Everything seems to work great except the graphic card fan and no display. The graphic card is connected with a PCI-E1 or 2(Theres 2 PCI-E cables, tried both of them) 6-pin cable that i think is correct. Like I said in the first post it shows 2 red LEDs which i have no idea why, but it seems that it's getting power. And i also said in the first post that the computer worked perfectly untill the new case (The old one was built by professionals and this new one i did myself)

That's strange.. Theres a 6-pin hole in the graphic card but the manual says that i need to connect a 4-pin 5V/12V cable from the psu

Okay, I'm on the same page now. Sorry.

I tried to find your manual on ASUS, but could not, so I don't know what the 2 LEDs mean. Where you sure to observe ESD control so no static damage occurred? You may have to take every thing out of the case and set the computer up on a wood breadboard or the like.

I see Newegg says there is a 6-pin connector - Newegg.com - ASUS EAH4850/HTDI/1G Radeon HD 4850 1GB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Desktop Graphics / Video Cards

Although 500 watts is a decent size PSU, depending on what else it is powering, it may be struggling. Use the eXtreme PSU Calculator Lite to determine your power supply unit (PSU) requirements. Plug in all the hardware you think you might have in 2 or 3 years (extra drives, bigger or 2nd video card, more RAM, etc.). Be sure to read and heed the notes at the bottom of the page. I recommend setting Capacitor Aging to 30%, and if you participate in distributive computing projects (e.g. BOINC or Folding@Home), I recommend setting TDP to 100%. Research your video card and pay particular attention to the power supply requirements for your card listed on your video card maker's website. If not listed, check a comparable card (same graphics engine and RAM) from a different maker. The key specifications, in order of importance are:

1. Current (amperage or amps) on the +12V rail,
2. Efficiency,
3. Total wattage.

Then look for power supply brands listed under the "Good" column of PC Mechanic's PSU Reference List. Ensure the supplied amperage on the +12V rails of your chosen PSU meets the requirements of your video card. Don't try to save a few dollars by getting a cheap supply. Digital electronics, including CPUs, RAM, and today's advanced graphics cards, need clean, stable power. A good, well chosen supply will provide years of service and upgrade wiggle room. I strongly recommend you pick a supply with an efficiency rating equal to, or greater than 80%. Look for the 80 Plus - EnergyStar Compliant label. And don't forget to budget for a good UPS with AVR (automatic voltage regulation).

I got 486W on the calculator.. If you're saying i need a new psu or something then why did the computer work before the new case ? My Graphics Card requires a minimum of 450W power

Boot the machine with only the CPU, RAM, and graphics connected. (Assuming all cables to graphics are installed.)

Does it boot with a display?

Nope it still does the same thing

Edit: Could it be that im lacking some cable on the power ? Would that cause the graphic card to act weird ?

Ok I gave up on trying to fix the computer myself, so I took it to a computer repairman. I will post the problem and solution to here unless it's a broken component.
Thanks for trying though.