Sites displaying blank webpages - new farm setup

Hi,
Apologies for what hopefully is an obvious question, but I'm very new to Sharepoint and trying to setup a new farm in 2013.
I've set a basic 3 tier topology, two WFE servers with an NLB, two App servers and a backend DB server.
I've created a few test web applications with site collections, on port 80 with a host header, authentication through NTLM. DNS pointing to the WFEs.
When I try and access the sites I just get a blank page, no error message. If I start the Web App service on the first App server I created (hosting central admin as well) I can then access the pages without any problems (DNS still pointing to the WFEs).
This seems to me like there is a problem somewhere, I would expect to be able to access through the WFEs without the Web App service running on the application servers.
Clueless where to start looking. Any ideas?
Many thanks,
Iain

Hi Iain,
Whether you got a blank page after multiple authentications.
Please try to disable the loop back check:
In Registry Editor, locate and then click the following registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
Right-click Lsa, point to New, and then click DWORD Value.
Type DisableLoopbackCheck, and then press ENTER.
Right-click DisableLoopbackCheck, and then click Modify.
In the Value data box, type 1, and then click OK.
Quit Registry Editor, and then restart your computer.
I hope this helps.
Thanks,
Wendy
Wendy Li
TechNet Community Support

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We have put one web server out of service in the farm to make sure that this isn't a result of stickyness not quite working.
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Generating configuration....
logging enable
logging fastpath
logging standby
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clock timezone standard GMT
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+------------------------------------------+
+-------------- HTTP statistics -----------+
+------------------------------------------+
LB parse result msgs sent : 421347     , TCP data msgs sent       : 2099597
Inspect parse result msgs : 0          , SSL data msgs sent       : 0
                      sent
TCP fin msgs sent         : 6169       , TCP rst msgs sent:       : 769
Bounced fin msgs sent     : 5          , Bounced rst msgs sent:   : 1
SSL fin msgs sent         : 0          , SSL rst msgs sent:       : 0
Drain msgs sent           : 337811     , Particles read           : 5040829
Reuse msgs sent           : 0          , HTTP requests            : 342499
Reproxied requests        : 183422     , Headers removed          : 37475
Headers inserted          : 342124     , HTTP redirects           : 0
HTTP chunks               : 224859     , Pipelined requests       : 71466
HTTP unproxy conns        : 267246     , Pipeline flushes         : 0
Whitespace appends        : 0          , Second pass parsing      : 0
Response entries recycled : 71302      , Analysis errors          : 0
Header insert errors      : 22         , Max parselen errors      : 215
Static parse errors       : 99         , Resource errors          : 0
Invalid path errors       : 0          , Bad HTTP version errors : 0
Headers rewritten         : 0          , Header rewrite errors    : 0
SSL headers inserted      : 0          , SSL header insert errors : 0
SSL spoof headers deleted : 0         , Unproxy msgs sent         : 267246
HTTP passthrough stat     : 0
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