电脑显示器开机后没显示 但接的投影仪有显示 是怎么回事

你的是台式机还是笔记本？

看主机是不是独立显卡的，如果是的右击在NVIDIA控制面板可以设置

笔记本电脑 型 号 切换视频的执行键 Acer Note 350, 750, 760, 780, 950 Ctrl-Alt-ESC while computer boots activates the setup menu; system config; advanced sys config; display device; LCD/CRT Note 971 FN + F5 AST Ascentia, Ascentia A series, PowerExec, 9xxN FN + F5 Ascentia J Series FN + F3 Ascentia P Series, Bravo, 800N, B5N FN + F12 Premium FN + D Altima All Shift-Ctrl-Alt-C Ambra All Ctrl-Alt-Esc for set-up screen FN + F2 FN + F5 Amrel All Set-up screen Shift-Ctrl-D AMS Power CD FN + F2 AMT NP-743D Set-up (Advanced) Screen Display Select CRT or LCD AT&T 3181, Globalyst 250 FN + F3 Clobalyst 200, Globalyst 3150 Safari FN + F6 Austin All Ctrl-Alt-Comma FN + F12 Award Modular Notebook FN + F6 Bondwell All reboot for LCD or CRT options to appear Canon BTO FN + F6 Innova 386NX Setup Menu Option Innova Book 360CD, 490CDS FN + F7 NoteJet 3CX Change CMOS to CRT Chaplet All Select from set-up screen FN + F6 FN + F4 Chembook All FN + F6 Chicony All Ctrl-Alt-Esc Automatic All Ctrl-alt-#6 FN + F7 FN + F4 Compaq Armada, LTE, Contura FN + F4 Presario FN + F2 Other Automatic, Ctrl-Alt< CompuAdd NBE 780 FN + F3 Set-up select Display LCD/CRT Other Automatic Compudyne Laptop Ctrl-Shift-D or set-up screen N386SXE FN + F8 Data General All Ctrl-Alt-Command Data View All Ctrl-Shift-M DEC HiNote FN + F4 425 SL FN + F5 Other Automatic Dell Latitude, CP-Inspiron FN + F8 FN + F12 Other Ctrl-Alt-< FN + D Dolch All Set Switch to CRT before boot-up Epson 650C Other Other FN + F12 EPS Technologies L166MMX, MP-975A FN + F4 Everex All Select from set-up screen Other FN + F10 Fujitsu Lifebook FN + F10 Gateway Solo, Liberty FN + F3 Colorbook FN + F1 Colorbook 2 Option in CMOS setup Grid All Ctrl-Alt-Tab FN + F2 Hitachi M120T/1000, M100D FN + F7 E100D/810 FN + F8 Hyundai All Set-up screen option Hewlett Packard All HP notebook PCs FN + F5 IBM Thinkpad 310, 36x, 380, 701, 75X, 760, 560, 770 FN + F7 Thinkpad 350, PS/Note 425C FN +F1 for setup LX40 Setup LCD to CRT Thinkpad 700 Ctrl-LT-S Infotel Ultra FN + F12 Jetbook All FN + F6 FN + F12 Kaypro All Boot with monitor connected Kris Tech All FN + F8 Macintosh PowerBook 3400 Select Monitor Icon on PowerBook Control Strip, Select Resolution to match display device (e.g. 800x600 Sinulscan for simultaneous display on PowerBook and on projector) PowerBook 1400 Requires Optional Video Card. Select Monitor Icon on PowerBook Control Strip, Select Resolution to match display device (e.g. 800x600 Simulscan for simultaneous display on PowerBook and on projector) PowerBook 160, 165, 180, 520, 540, 5300 Control Panel Folder, PowerBook Display folder, Activate Video Mirroring, warm reboot. Or (if display problems occur w/mirroring) Control Panel folder, Monitors, switch primary display by dragging white menu bar to monitor 2. PowerBook 140, 145, 150, 170 No Video Port. Requires 3rd party interface Portable 100 Not Compatible Magitronic All FN + F4 Mastersport All FN + F2 Micron Millenia, Transport FN + F2 FN + F12 Midwest Micro Elite FN + F11 Mitsubishi All SW2 On Off Off Off to activate SW2 Off On On On to de-activate NCR All Set-up screen option NEC Versa 2000, 4000 series, 5000 series, 6000 series, M, P, V, MX series, Ultralite FN + F3 Versa 2400 FN + F10 Versa S FN + F2 Other Select "Active" from set-up Parkard Bell All FN + F10 FN + F2 Panasonic All FN + F2 Panasonic set-up program ProStar 5200, 6200, 12000 FN + F6 Other Ctrl-Alt-S at startup Sager All FN + F6 NP8600 FN + F9 Sampo All CTRL-ALT SHIFT C Samsung 810 FN + F4 55200 Set-up screen option Pro 500 FN +F5 Pro 800, Sens 700 FN + F6 Sanyo All Set-up screen option Sharp All FN + F5 Sotec PC3020, PC9000, PC9020 FN +F5 Other FN +F1 Tandy All Ctrl-Alt-Insert Tangent All FN + F5 Texas Instruments 370, 390, Travelmate 7000, Extensa 36x FN + F2 FN + F3 Travelmate 2000 Switch CRT On Travelmate LT286/45 Press SETUP key on keyboard 3000 Type ALTVID at DOS Prompt 4000 Ctrl-Alt-Setup 4000M and 4000E FN + Setup at DOS prompt - Screen Display = BOTH 5000 Ctrl-Alt-Esc 5100/5200 Win95 Control Panel, TI SETUP, System Config, Display device, LCD/CRT/both. Win 3.1 Travelmate n/b Setup, TI SETUP, System Config, Display device, LCD/CRT/both 6020, 6030, 6050, Extensa 600CD, 650CDT FN + F12 Extensa 5xx/6xx Series FN + F10 Other FN + F5 Top-Link All Set-up Screen option FN + F6 Toshiba 1000, 1200, 1600, 3100E, 3200 FN + End 1100 Ctrl-Alt-End 1850 Reboot T1910 Satellite Automatic, no simultaneous display T1950CT, T1960CT type TSetup at DOS prompt Select display location int/ext/both (internal, external, or both displays) 105CS, 110CT, 115CS, 200CDS, 400, 410, 415, 420, 430, 500CDT, 610, 650CT 2100CT, 2105CT, 2130CS, 2150CS, 2150CDT, 2150CT, 2400CS, 2400CT, 2450CT, 3600DT, 4500, 4700, 4800, 4850, 4900, Tecra 700CDT, 720CDT, 730CDT FN + F5 3100 Ctrl-Alt-End 3100E, 3200 FN + ENd 3100SX, 3200SX N/A PORT ACTIVE 3400 Needs SCSI Adapter for ext. video 4400sx N/A PORT ACTIVE 5100 Ctrl-Alt-End 5100/100, 5200, 5200/100 N/A PORT ACTIVE 610CT Needs SCSI adapter for ext. video Twinhead Slimnote 5100T, 9133CX FN + F5 Slimnote 8xx Series FN + F5 US Logic All FN + F8 Winbook XP, XP5 FN + F6 (sinul) FN + F10 (int/ext) XP5 Pro, FX FN + F12 XL FN + F2 LM FN + F8 Wyse All Software Driven Zenith Z-Noteflex, Z-StarEX FN +F10 Z-NoteGT FN + F7 Zeos 486 CTRL-SHIFT D 486 Meridian FN + F1