Won't boot, screen is white.
My machine is: Mac Pro 4.1 2009, Quad.
The machine suddenly stopped working and it will not boot. When I press power button I get only white screen (little gray maybe) and it never does anything.
I tried removing all hard drives (unplugging all SATA cables) and RAM modules (4x8GB regular DDR3), I still had original memory so I tried that but no effect.
At first I thought it was GPU issue because it behaved little funny - it'd take 5-10 seconds for display to wake up after waking up from sleep or powering up. It would also occasionaly change colors for a fraction of second but nothing serious.
I put GPU away and tried powering it up, hoping to reach it via network (I have LAN cable set up and LogMeIn installed). It did not show up in web panel.
Next I connected my Macbook Pro and Mac Pro with FireWire 800 cable. I held "T" key when powering up Mac Pro in hopes to reach it via target disk mode (and then boot the machine off MBP to set up screen sharing) but that didn't work either.
I inspected CPU board twice. Only slight problem I found was that on one side of heatsink the fin was slightly bent like this: http://img109.imageshack.us/img109/6621/...
I slightly pressured my finger and touched the fin, it got narrow - I didn't use any force really. This didn't help too. Mac Pro is connected to CyberPower UPS so I tried another power outlet, that didn't had any effect too.
It seems that computer responds to keyboard somewhat as I managed to do PRAM reset but holding ALT key does nothing, Apple logo nor circular loading symbol never appears.
I am running out of ideas here, the machine worked perfectly for the year I've had it and I'm really worried there's something wrong with mobo. I will probably take it to authorized repair centre but I was hoping someone would give me some advice. Is there anything I can do before bringing it to shop?
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