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Manufacturer and model?

Power supply?

In case you only do Photoshop, dual 2.4 GHz (3.2GHz turbo however) Xeons are waste because single thread performance is very poor (compared to quad core Intels) and Photoshop is crappy software. Video/photo editing is something that should use many cores effectively but Adobe just don't really...

Perhaps that external display during boot can be enabled from BIOS. Altough pretty hard to adjust anything on BIOS without seeing settings...

Google's first result was wrong then, it said HDMI + VGA. Your suggestion looks good.

Yes. It seems that best way is: Acer 1: HDMI Acer 2: VGA LG: Displayport to HDMI adapter

Both cards have similar connectors. Both adapters look like OK. List your displays to decide which one is better choice. Speed and/or image quality will probably suffer at least some way. So I suggest that "worst" display (meaning: display that is mostly used for static use, like TV) is...

Cable looks to be right type. However I think you will need active Displayport to HDMI adapter to get triple monitor system working. So while that cable is right type, it's not guaranteed it will work. Not sure about this one though. Perhaps graphic card manual tells. What exactly is that 7850...

For GPU, take something else, like R9 390. GTX970 has only 3.5GB usable (fast) memory and also badly lacks Directx 12 features. Also not good for VR. For PSU, take something with better quality. Corsair CX is medium at most. Windows 7 is old or very cheap? For full price, get Windows 10...

CPU and graphis card are OK for "medium gaming". Unless your son is using memory intensive software and/or games, I see no reason to upgrade RAM. 4GB is enough for many uses.

Poor PSU options there, many good parts are out of stock. That is somewhat good: 47961 650W ATX COOLER MASTER G650M SEMI-MODULAR 80+ BRONZE $99

RAM looks OK Good quality PSU http://www.amazon.ca/XFX-80-Plus-Supply-Certified-P1-550G-TS3X/dp/B00HW979AQ/ref=sr_1_3?s=pc&ie=UTF8&qid=1451678202&sr=1-3 No wireless card on mobo.

Log in with Administrator and make another account with Admin privileges.

Many times "better" product is cheaper than "worse" product. So nothing is necessarily wrong. Go with 390X with that pricing.

Get new monitor and play games with iGPU until you get one. That iGPU is good for 1080p videos.

Should be Displayport to Displayport yes.

AMD just released Radeon 380X. It is old technology just like every Nvidia and AMD video card. 28nm process made debut about 4 years ago... Because Acer is very reluctantly giving full specs, I looked elsewhere...

While 3440 x 1440 and 100Hz is thoretically barely possible with Displayport 1.2, I see no reason to go with that kind of old tech. So instead pick something that supports Displayport 1.3 or go with lower resolution.

Oh yeah, that might be the problem. That laptop requires DDR3L and that 8GB memory is DDR3. Only difference is voltage, DDR3L is 1.35V and DDR usually is 1.5V. Very stupid to require DDR3L but OEM machines have often that kind of traps. BIOS settings are very limited on OEM machines. If that...

DRAM memory compatibility is never 100%. Sometimes RAM and motherboard just don't work together even if specs are OK.